Model Systems Engineering Documents for Central Traffic Signal Systems

The system shall provide monitoring and control access from the following locations.

• Agency TMC
• Agency LAN or WAN
• Other agency TMC (SPECIFY)
• Local controller cabinets (hard wire)
• Local controller cabinets (wireless)
• Remote location via internet

Demonstration

The system shall allow remote access using a secure Virtual Private Network (VPN).

Demonstration

The system shall allow operators from different agencies to view/edit traffic signal databases owned by other agencies, subject to assigned privilege level.

Demonstration

The system shall allow XX number of users to log on to the system simultaneously.

Demonstration

The system shall allow multiple operators to access an intersection database simultaneously.

Demonstration

The system shall allow multiple TSS Operators to view the status of an intersection or group of intersections simultaneously.

Demonstration

The system shall restrict control of each intersection database to a single user at a time.

Demonstration

The system shall release lock of intersection database after a user-specified period of inactivity.

Demonstration

The system shall allow access to a traffic signal database on a first come, first served basis.

Demonstration

The system shall allow administrator to terminate intersection control by other users with lesser user rights.

Demonstration

The system shall allow access to a traffic signal database based on user privileges.

Demonstration

The system shall provide the ability to control and limit user access via user privileges (allowing for different levels of user access to system features and functions).

• Local access to the system
• Remote access to the system
• System monitoring
• System manual override
• Database
• Administration of the system
• Signal controller group access
• Access to classes of equipment
• Access to equipment by jurisdiction
• System parameters
• Report generation
• Configuration
• Security alerts

Demonstration

The system shall provide user privileges definable for the following:

Demonstration

Geographic area

Demonstration

Time of Day

Demonstration

Device ownership

Demonstration

The system shall provide user privileges definable on a functional level:

Demonstration

TSS Manager

Demonstration

TSS Operator

Demonstration

External System

Demonstration

TSS Maintainer

Demonstration

The system shall comply with the agency's security policy as described in (specify appropriate policy document)

Analysis

The system shall provide full access to the administrator.

Demonstration

The system shall show operators/administrator who is logged in to the system at a given time.

Demonstration

For Adaptive Systems, the ASCT shall be implemented with a security policy that addresses the following selected elements:

• Local access to the ASCT
• Remote access to the ASCT
• System monitoring
• System manual override
• Development
• Operations
• User login
• User password
• Administration of the system
• Signal controller group access
• Access to classes of equipment
• Access to equipment by jurisdiction
• Output activation
• System parameters
• Report generation
• Configuration
• Security alerts
• Security logging
• Security reporting
• Database
• Signal controller

Analysis

The ASCT shall provide monitoring and control access at the following locations:

Demonstration

Agency TMC

Demonstration

Agency LAN or WAN

Demonstration

Other agency TMC (Specify)

Demonstration

Other agency TMC (Specify)

Demonstration

Local controller cabinets (wireless)

Demonstration

Local controller cabinets (hard wire)

Demonstration

Remote locations via internet

Demonstration

Remote locations via internet

Demonstration

The ASCT shall comply with the agency's security policy as described in (specify appropriate policy document).

Analysis

The ASCT shall not prevent access to the local signal controller database, monitoring or reporting functions by any installed signal management system.

Demonstration

The system shall control a minimum of XXX local signal controllers

Demonstration

The system shall allow intersections to be included in a group.

Demonstration

A group shall support up to XX signals.

Demonstration

The system shall allow an intersection to be included in two or more groups.

Demonstration

The system shall allow intersections to change grouping by time of day schedule.

Demonstration

The system shall allow intersections to change grouping by manual command.

Demonstration

The system shall allow intersections to change grouping by (enter trigger).

Demonstration

The ASCT shall control a minimum of XX signals concurrently. Note: communications network characteristics based on mileage distance.

Demonstration

The ASCT shall support groups of signals.

Demonstration

The boundaries surrounding signal controllers that operate in a coordinated fashion shall be defined by the user.

Demonstration

The ASCT shall control a minimum of XX groups of signals.

Demonstration

The size of a group shall range from 1 to XX signals.

Demonstration

Each group shall operate independently

Demonstration

The boundaries surrounding signal controllers that operate in a coordinated fashion shall be altered by the ASCT system according to configured parameters.

Demonstration

The boundaries surrounding signal controllers that operate in a coordinated fashion shall be altered by the system according to a time of day schedule. (For example: this may be achieved by assigning signals to different groups or by combining groups.)

Demonstration

The boundaries surrounding signal controllers that operate in a coordinated fashion shall be altered by the system according to traffic conditions. (For example: this may be achieved by assigning signals to different groups or by combining groups.)

Demonstration

The boundaries surrounding signal controllers that operate in a coordinated fashion shall be altered by the system when commanded by the user.

Demonstration

The Performance Measurement Server shall configure how the high-resolution data is handled from local traffic signal controllers. [This requires the agency to provide traffic signal controllers that store the high-resolution data, which are not covered by these Model Documents.]

Demonstration

High-resolution data shall include all enumerated events as described in Sturdevant, et. al., Indiana High Resolution Data Logger Enumerations, November, 2012, or later document as developed under Pooled Fund Study TPF-5(377).

Demonstration

High-resolution data interface is defined by (Specify latest interface control document, if available—Pooled Fund Study TPF-5(377), currently underway, will: Update the data logger specification to provide secure file transfer, incorporate new enumerations that have emerged, and logging new connected vehicle messages.

Test

The Performance Measurement Server shall be a separate server, independent of the TSS or ASCT.

Inspection

The Performance Measurement Server shall run ATSPM version 4.0 (or more recent version) available from the FHWA Open Source Application Development Portal.

Demonstration

The Performance Measurement Server shall be co-located with the TSS. (In such cases, it shall be owned by the TSS System Manager.) [This requirement is exclusive of 3.1.3.3.1.3.3—choose one or the other]

Inspection

The Performance Measurement Server shall be located at an alternative location [specify] and managed and maintained by a separate entity [specify]. [This requirement allows the server to be shared by multiple agencies but managed by one of them, or provided as a service by a private-sector provider. Please specify in this requirement. This requirement is exclusive of 3.1.3.3.1.3.2]

Inspection

The Performance Measurement Server shall be integrated into the TSS (ASCT).

Inspection

The Performance Measurement Server shall run ATSPM version 4.0 (or more recent version) available from the FHWA Open Source Application Development Portal. The open-source software may be revised to facilitate integration, or to extend to additional features that may be required herein.

Demonstration

The system shall fully satisfy all requirements when connected to XX local controllers (SPECIFY local controller type)

Demonstration

Controller type (list applicable equipment)

Inspection

Local firmware (list applicable firmware)

Inspection

Communications media and protocols (list applicable equipment)

Demonstration

AB3418E

Demonstration

NTCIP (SPECIFY relevant items)

Demonstration

The system shall fulfill all requirements when connected to XX local controller firmware (SPECIFY local controller firmware)

Demonstration

The system shall fully satisfy all requirements when connected to the existing communications network

Demonstration

The system shall fulfill requirements within a communications bandwidth limit of XX Mbps (specify applicable limits).

Test

The system shall work with the existing communications architecture (DEFINE characteristics, specifications and layout of system).

Demonstration

The system shall operate on a stand alone server located at (SPECIFY LOCATION)

Inspection

The system shall operate as cloud based.

Demonstration

The system shall operate with center to center capabilities.

Demonstration

The system shall be integrated with an Advance Traffic Management System (SPECIFY)

Demonstration

The system shall operate with on-street masters.

Demonstration

The system shall use the following communications protocols with traffic signal controllers (SPECIFY as appropriate)

Demonstration

Ethernet

Demonstration

Serial

Demonstration

Other [Specify]

Demonstration

Any field device installed as part of the TSS shall fulfill NEMA TS-2 environmental requirements.

Test

The system shall be fully implemented within the available budget of $[Specify]. (or included in procurement documents but not in system requirements)

Analysis

The system shall download timing parameters to two or more controllers with one command.

Demonstration

The system shall create a timing database that includes all settable signal timing parameters for a given intersection local controller based on TSS Operator input and appropriate look up tables (SPECIFY controller and firmware version).

Demonstration

The system shall allow TSS Operator to enter all settable timing parameter values manually.

Demonstration

The system shall provide default intersection timing database templates containing the following data (SPECIFY others if needed):

• Min green, Max green, walk, flashing don't walk, yellow, red
• Emergency Vehicle Preemption data
• Flashing yellow left turn arrow

Demonstration

The system shall create a copy of an entire intersection timing database.

Demonstration

The system shall copy parts of one intersection timing database and paste to another intersection timing database (e.g., time of day schedule)

Demonstration

The system stall copy parts of an intersection timing database and paste within the same database (e.g., timing pattern data)

Demonstration

The system shall create up to (X) versions of an intersection timing database.

Demonstration

The system shall provide safeguards when developing new signal databases, including:

• Range checking
• Timing plan verification
• Conflicting phases

Demonstration

The system shall create a timing sheet that includes:

• All timing parameters relevant for operating a traffic signal.
• Phase rotation diagram with north arrow
• User selected parts of the timing database
• Modified timings
• User specified
• Only non-zero timing parameters

Demonstration

The system shall transfer the following signal timing data to and from Optimization Software (SPECIFY TYPE and Version ):

• Node number
• Phase number and direction
• Phase minimum green
• Phase vehicle yellow clearance
• Phase pedestrian walk
• Phase vehicle all red
• Phase pedestrian clearance
• Cycle length
• Offset
• Coordination splits

Demonstration

The system shall upload/download the intersection database to a controller:

• By manual TSS Operator command
• By time of day schedule

Demonstration

The system shall download the entire intersection database to a controller.

Demonstration

The system shall upload the entire intersection database from a controller.

Demonstration

The system shall download select parts of an intersection database to a controller.

Demonstration

The system shall upload select parts of an intersection database from a controller.

Demonstration

The system shall download timing parameters to two or more controllers with one command.

Demonstration

The system shall upload timing parameters from two or more controllers with one command.

Demonstration

The system shall request user confirmation of command prior to downloading data from the central database to a controller.

Demonstration

The system shall request user confirmation of command prior to saving uploaded data from a controller in the central database.

Demonstration

The system shall archive all intersection databases when commanded by user.

Demonstration

The system shall cancel upload/download if any interruptions occur during the process.

Demonstration

The system shall revert to previous version of the database at the request of the user.

Demonstration

The system shall log any changes made to the database, including:

• What was changed
• Who made the change
• When the change occurred

Demonstration

The system shall compare two intersection databases (central and local) and highlight the differences.

Demonstration

The system shall save the entire uploaded intersection database.

Demonstration

The system shall save selected parts of an uploaded intersection database.

Demonstration

The system shall clearly identify the official version of the timing database.

Demonstration

The system shall provide multiple methods to open an intersection database:

• Dynamically select intersection on map
• Search feature that uses intersection name and partial name
• Search feature that uses intersection ID number

Demonstration

The ASCT shall log the following events: (edit as appropriate)

Demonstration

Time-stamped vehicle phase calls

Demonstration

Time-stamped pedestrian phase calls

Demonstration

Time-stamped emergency vehicle preemption calls

Demonstration

Time-stamped transit priority calls

Demonstration

Time-stamped railroad preemption calls

Demonstration

Time-stamped start and end of each phase

Demonstration

Time-stamped controller interval changes

Demonstration

Time-stamped start and end of each transition to a new timing plan.

Demonstration

The ASCT shall export its systems log in the following formats: (edit as appropriate)

• MS Excel
• Text
• CVS
• Open source SQL database

Demonstration

The ASCT shall store the event log for a minimum of XX days

Demonstration

The TSS shall store results of all signal timing parameter calculations for a minimum of XX days.

Demonstration

The ASCT shall store the following measured data in the form used as input to the adaptive algorithm for a minimum of XX days: (edit as appropriate)

• volume
• occupancy
• queue length
• phase utilization
• arrivals in green
• green band efficiency

Demonstration

The ASCT system shall archive all data automatically after a user-specified period not less than XX days.

Demonstration

The ASCT shall provide data storage for a system size of XX signal controllers. The data to be stored shall include the following: (edit as appropriate)

• Controller state data
• Reports
• Log data
• Security data
• ASCT parameters
• Detector status data

Demonstration

The ASCT shall calculate and report relative data quality including:

• The extent data is affected by detector faults
• Other applicable items

Demonstration

The ASCT shall report comparisons of logged data when requested by the user:

• Day to day,
• Hour to hour
• Hour of day to hour of day
• Hour of week to hour of week
• Day of week to day week
• Day of year to day of year

Demonstration

The ASCT shall store data logs in a standard database (specify as appropriate).

Demonstration

The ASCT shall report stored data in a form suitable to provide explanations of system behavior to public and politicians and to troubleshoot the system.

Analysis

The ASCT shall store the following data in XX minute increments: (edit as appropriate)

• volume
• occupancy
• queue length

Demonstration

The ASCT shall take user-specified action in the absence of valid detector data from XX vehicle detectors within a group. (SELECT THE APPROPRIATE ACTION.)

Test

The ASCT shall release control to central system control.

Test

The ASCT shall release control to local operations to operate under its own time-of-day schedule.

Test

The ASCT shall use the following alternate data sources for operations in the absence of the real-time data from a detector:

Test

• Data from a user-specified alternate detector.

Test

• Stored historical data from the failed detector.

Test

The ASCT shall switch to the alternate source in real time without operator intervention.

Test

In the event of a detector failure, the ASCT shall issue an alarm to user-specified recipients. (This requirement may be fulfilled by sending the alarm to a designated list of recipients by a designated means, or by using an external maintenance management system.

Test

In the event of a failure, the TSS/ASCT shall log details of the failure in a permanent log.

Test

The permanent failure log shall be searchable, archivable and exportable.

Demonstration

The TSS shall execute user-specified actions when communications to one or more signal controllers fails within a group. (SELECT THE APPROPRIATE ACTION)

Test

In the event of loss of communication to a user-specified signal controller, the TSS shall release control of all signal controllers within a user-specified group to local control.

Test

The TSS shall switch to the alternate operation in real time without operator intervention.

Test

In the event of communications failure, the TSS shall issue an alarm to user-specified recipients. (This requirement may be fulfilled by sending the alarm to a designated list of recipients by a designated means, or by using an external maintenance management system.

Test

The TSS shall issue an alarm within XX minutes of detection of a failure.

Test

The ASCT shall execute user-specified actions when communications to one or more signal controllers fails within a group. (SELECT THE APPROPRIATE ACTION)

Test

In the event of loss of communication to a user-specified signal controller, the ASCT shall release control of all signal controllers within a user-specified group to local control.

Test

The ASCT shall switch to the alternate operation in real time without operator intervention.

Test

In the event of communications failure, the ASCT shall issue an alarm to user-specified recipients. (This requirement may be fulfilled by sending the alarm to a designated list of recipients by a designated means, or by using an external maintenance management system.

Test

The ASCT shall issue an alarm within XX minutes of detection of a failure.

Test

In the event of a communications failure, the TSS/ASCT shall log details of the failure in a permanent log.

Test

The permanent failure log shall be searchable, archivable and exportable.

Demonstration

The ASCT shall execute user-specified actions when adaptive control fails:

Demonstration

The ASCT shall release control to central system control.

Demonstration

The ASCT shall release control to local operations to operate under its own time-of-day schedule.

Demonstration

In the event of adaptive processor failure, the ASCT shall issue an alarm to user-specified recipients. (This requirement may be fulfilled by sending the alarm to a designated list of recipients by a designated means, or by using an external maintenance

Test

The permanent failure log shall be searchable, archivable and exportable.

Demonstration

During adaptive processor failure, the ASCT shall provide all local detector inputs to the local controller.

Test

The system shall update the status of all traffic signal controller connected to the system every (XX) seconds.

Demonstration

The system shall update the status of all traffic signal controllers connected to the system 24 hours a day, 7 days a week.

Demonstration

The system shall provide a map that displays different levels of information:

• Statewide
• Area-wide
• Corridor
• Intersection

Demonstration

The system shall provide a display that uses a cloud based system map (SPECIFY DETAILS)

Demonstration

The system shall provide a display that uses an existing agency map as background (Autocad, GIS, JPEG, etc.)

Demonstration

The system shall move between levels seamlessly, without having to open new files or windows.

Demonstration

The system shall have pan and zoom capabilities.

Demonstration

The system shall automatically adjust the display depending on the 'zoom level'.

Demonstration

At the state wide and area-wide level map, the system shall display a color coded status of the following systems:

• Communication
• Coordination
• Intersection flash mode
• Preemption

Demonstration

At the corridor level map, the system shall display the following timing related information:

• Real time or other measurable period [Specify period length(s)] time-space-diagrams
• Split times
• Phase status
• Detector status (vehicle and pedestrian)
• Local cycle lengths/timer
• Background cycle length/timer
• Offset
• Intersection identifier

Demonstration

The system shall provide a library of intersection drawings (e.g., standard four-legged intersections, standard tee intersection, five-legged intersection, six legged intersection, etc.) to develop intersection level graphics that are geometrically correct diagrams.

Demonstration

The system shall provide a library of symbols for inputs and outputs to help construct the intersection display.

Demonstration

The system shall allow the TSS Operator to import customized graphical icons to the map icon library.

Demonstration

The system shall display multiple individual intersection-level views simultaneously as separate displays or tiled windows (SPECIFY minimum and maximum numbers).

Demonstration

The system shall open the intersection display when the intersection on the main map is clicked on.

Demonstration

The system shall show the current phase status of an intersection upon operator selection of the associated intersection icon on the map display.

Demonstration

The system shall display the following traffic signal controller information:

• Intersection name/number
• Controller type
• Firmware and version
• IP address

Demonstration

The system shall have the capability to display all controller outputs in real-time, including:

• Vehicle phases (including overlaps)
• Pedestrian phases
• Bicycle phases
• Signs controlled by the signal controller

Demonstration

The system shall have the capability to display all controller inputs in real time, including:

• Vehicle detector actuations
• Pedestrian detector actuations
• Bicycle detector actuations
• Transit signal priority
• Railroad preemption
• Emergency vehicle preemption

Demonstration

The system shall display the data shown on the virtual controller front panel based on a user-selected intersection.

Demonstration

The system shall receive the current time from a source:

• WWV radio
• Network Time Protocol server
• GPS time source
• Neighboring traffic signal network

Demonstration

The system shall re-sync the local controller time clock through a manual command.

Demonstration

The system shall re-sync the local controller's time clock automatically [Specify conditions for triggering automatic re-sync].

Demonstration

The system shall provide a time synch to each controller using:

• WWV radio
• Network Time Protocol server
• GPS time source
• Neighboring traffic signal network

Demonstration

The system shall allow the traffic signals to operate in coordinated mode.

Demonstration

The system shall allow the traffic signals to operate according to local control in case of communications failure.

Test

The system shall allow the traffic signals to operate according to local control in case of TSS failure.

Test

The system shall download manual command to the local controller to change intersection operations to free.

Demonstration

The system shall download manual command to the local controller to change intersection operations to flash.

Demonstration

The system shall download manual command to the local controller to implement a timing plan

Demonstration

The system shall operate manual selection of timing plans as a higher priority over all other modes of plan selection.

Demonstration

The system shall request confirmation from the TSS Operator before a manual command is implemented.

Demonstration

The system shall provide a start and end time for manual commands.

Demonstration

The system shall provide a duration for manual commands.

Demonstration

The system shall revert to time of day operation after the manual command ends.

Demonstration

The system shall time-stamp a log of all manual commands.

Demonstration

The system shall place non-locking demand on user specified pedestrian and vehicle phases, at a user specified intersection, from the central.

Demonstration

The system shall place a locking demand on user specified pedestrian and vehicle phases, at a user specified intersection, from the central.

Demonstration

The system shall place a non-locking call replicating an emergency vehicle preemption call on a user specified preemption channel at a user specified intersection.

Demonstration

The system shall receive data from another system (SPECIFY DETAILS).

Demonstration

The system shall receive data from another system (SPECIFY DETAILS).

Demonstration

In the presence of external input, the system shall direct user-configured local controllers or groups to engage a user-defined emergency vehicle preemption.

Demonstration

In the presence of external input, the system shall direct user-configured local controllers or groups to engage a user-defined railroad preemption.

Demonstration

The system shall send data to another system (SPECIFY DETAILS).

Demonstration

The system shall turn on and turn off message signs from a manual command.

Demonstration

The system shall turn on and turn off message signs based on a user specified trigger (SPECIFY).

Demonstration

The system shall interface with external rail preemption system. (explain the external system and refer to other interfaces as appropriate)

Demonstration

The system shall interface with external emergency vehicle preemption system. (explain the external system and refer to other interfaces as appropriate)

Demonstration

The system shall interface with external light rail transit. (explain the external system and refer to other interfaces as appropriate)

Demonstration

The system shall interface with external bus priority system. (explain the external system and refer to other interfaces as appropriate)

Demonstration

The system shall operate in the following control modes:

Demonstration

Time of day schedule

Demonstration

Manual control

Demonstration

Traffic responsive

Demonstration

External command

Demonstration

Local control mode

Demonstration

Central control mode

Demonstration

The system shall implement the following user-specified actions according to a time of day schedule:

Demonstration

Re-synch the local controller time clock

Demonstration

.Activate a coordination pattern

Demonstration

Activate an external output

Demonstration

Deactivate an external output

Demonstration

The system shall operate in traffic responsive mode when commanded:

• By manual TSS Operator command
• By time of day schedule
• By external input command

Demonstration

The TSS shall accept a user-defined assignment of intersection detectors as system detectors.

Demonstration

The TSS shall accept a user-defined occupancy weighting factor for each system detector.

Demonstration

The TSS shall accept a user-defined traffic-responsive control period.

Demonstration

The TSS shall sum volume plus weighted occupancy for each system detector over the duration of the control period (volume comprises distinct detection of on and off events, and weighted occupancy is the percentage of time the detector is occupied by a vehicle multiplied by the occupancy weighting factor)

Inspection/Analysis

The TSS shall accept a user-defined detector weighting factor to be applied to each system detector volume plus weighted occupancy.

Demonstration

The TSS shall multiply the volume plus weighted occupancy by the detector weighting factor.

Inspection/Analysis

The TSS shall select coordination patterns based on threshold levels (this is an alternative to the pattern recognition method).

Test

The TSS shall accept a user-defined selection of system detectors designated as inbound detectors.

Demonstration

The TSS shall accept a user-defined selection of system detectors designated as outbound detectors.

Demonstration

The TSS shall total the weighted volume plus weighted occupancy for inbound detectors within each intersection group over the control period.

Inspection/Analysis

The TSS shall total the weighted volume plus weighted occupancy for outbound detectors within each intersection group over the control period.

Inspection/Analysis

The TSS shall accept user-defined thresholds for inbound pattern selection.

Demonstration

The TSS shall accept user-defined thresholds for outbound pattern selection.

Demonstration

The TSS shall accept different thresholds for increasing weighted volume plus weighted occupancy totals than for decreasing weighted volume plus weighted occupancy totals (this provides the ability to incorporate hysteresis).

Demonstration

The TSS shall accept user-defined coordination pattern designations for each level of total weighted volume plus weighted occupancy bounded by thresholds.

Demonstration

The TSS shall compare the weighted volume plus weighted occupancy totals against the defined thresholds.

Inspection/Analysis

The TSS shall engage the inbound or outbound coordination pattern defined for the weighted volume plus weighted occupancy totals.

Test

The TSS shall select coordination patterns based on pattern recognition (this is an alternative to the threshold method).

Test

The TSS shall accept a table of coordination pattern designations coupled to user-defined "signature" total weighted volume plus weighted occupancy values (totals over the duration of the control period).

Demonstration

The TSS shall compare the total weighted volume plus weighted occupancy for each intersection group over the duration of the control period against the user-defined "signature" values.

Inspection/Analysis

The TSS shall engage the coordination pattern with the signature value that comes closest to the total weighted volume plus weighted occupancy for the intersection group.

Test

The ASCT shall operate non-adaptively during the presence of a defined condition.

Test

The ASCT shall operate non-adaptively when adaptive control equipment fails.

Test

The ASCT shall operate non-adaptively when a user-specified detector fails.

Test

The ASCT shall operate non-adaptively when the number of failed detectors connected to a signal controller exceeds a user-defined value.

Test

The ASCT shall operate non-adaptively when the number of failed detectors in a group exceeds a user-defined value.

Test

The ASCT shall operate non-adaptively when a user-defined communications link fails.

Test

The ASCT shall operate non-adaptively when a user manually commands the ASCT to cease adaptively controlling a group of signals.

Demonstration

The ASCT shall operate non-adaptively when a user manually commands the ASCT to cease adaptive operation.

Demonstration

The ASCT shall operate non-adaptively in accordance with a user-defined time-of-day schedule.

Demonstration

The ASCT shall operate non-adaptively when commanded by an external system process.

Demonstration

The ASCT shall alter the adaptive operation to achieve required objectives in user-specified conditions. (The required objectives are specified in Needs Statement 4.1.1)

Analysis

When current measured traffic conditions meet user-specified criteria, the ASCT shall alter the state of the signal controllers, maximizing the throughput of the coordinated route.

Demonstration

When current measured traffic conditions meet user-specified criteria, the ASCT shall alter the state of signal controllers, preventing queues from exceeding the storage capacity at user-specified locations.

Demonstration

When current measured traffic conditions meet user-specified criteria, the ASCT shall alter the state of signal controllers providing equitable distribution of green times.

Demonstration

When current measured traffic conditions meet user-defined criteria, the ASCT shall alter the state of signal controllers providing two-way progression on a coordinated route.

Demonstration

The ASCT shall provide maximum and minimum phase times.

Demonstration

The ASCT shall provide a user-specified maximum value for each phase at each signal controller.

Demonstration

The ASCT shall not provide a phase length longer that the maximum value.

Demonstration

The ASCT shall provide a user-specified minimum value for each phase at each signal controller.

Demonstration

The ASCT shall not provide a phase length shorter than the minimum value.

Demonstration

The ASCT shall detect repeated phases that do not serve all waiting vehicles. (These phase failures may be inferred, such as by detecting repeated max-out.)

Demonstration

The ASCT shall alter operations, to minimize repeated phase failures.

Demonstration

The ASCT shall determine the order of phases at a user-specified intersection. (The calculation will be based on the optimization function.)

Demonstration

The ASCT shall provide coordination along a route.

Demonstration

The ASCT shall coordinate along a user-defined route.

Demonstration

The ASCT shall determine the coordinated route based on traffic conditions.

Demonstration

The ASCT shall determine the coordinated route based on a user-defined schedule.

Demonstration

The ASCT shall store XX user-defined coordination routes.

Demonstration

The ASCT shall implement a stored coordinated route by operator command.

Demonstration

The ASCT shall implement a stored coordinated route based on traffic conditions.

Demonstration

The ASCT shall implement a stored coordinated route based on a user-defined schedule.

Demonstration

The ASCT shall not prevent the use of phase timings in the local controller set by agency policy.

Demonstration

The ASCT shall not prevent protected/permissive left turn phase operation.

Demonstration

The ASCT shall not prevent the protected left turn phase to lead or lag the opposing through phase based upon user-specified conditions.

Demonstration

The ASCT shall prevent skipping a user-specified phase when the user-specified phase sequence is operating.

Demonstration

The ASCT shall prevent skipping a user-specified phase based on the state of a user-specified external input.

Demonstration

The ASCT shall prevent skipping a user-specified phase according to a time of day schedule.

Demonstration

The ASCT shall omit a user-specified phase when the cycle length is below a user-specified value.

Demonstration

The ASCT shall omit a user-specified phase based on measured traffic conditions.

Demonstration

The ASCT shall omit a user-specified phase based on the state of a user-specified external input.

Demonstration

The ASCT shall omit a user-specified phase according to a time of day schedule

Demonstration

The ASCT shall assign unused time from a preceding phase that terminates early to a user-specified phase as follows:

• next phase;
• next coordinated phase; user-specified phase.

Demonstration

The ASCT shall assign unused time from a preceding phase that is skipped to a user-specified phase as follows:

• previous phase;
• next phase;
• next coordinated phase;
• user-specified phase.

Demonstration

The ASCT shall not alter the order of phases at a user-specified intersection.

Demonstration

The ASCT shall detect the presence of queues at pre-configured locations.

Demonstration

When queues are detected at user-specified locations, the ASCT shall execute user-specified timing plan/operational mode.

Demonstration

When queues are detected at user-specified locations, the ASCT shall execute user-specified adaptive operation strategy.

Demonstration

When queues are detected at user-specified locations, the ASCT shall omit a user-specified phase at a user-specified signal controller.

Demonstration

The ASCT shall meter traffic into user-specified bottlenecks by storing queues at user-specified locations.

Demonstration

The ASCT shall store queues at user-specified locations.

Demonstration

The ASCT shall maintain capacity flow through user-specified bottlenecks.

Demonstration

When queues are detected at user-specified locations, the ASCT shall limit the cycle length of the group to a user-specified value.

Demonstration

(Sequence-based only) The ASCT shall select cycle length based on a time of day schedule.

Demonstration

(Sequence-based only) The ASCT shall calculate phase lengths for all phases at each signal controller to suit the current coordination strategy.

Demonstration

(Sequence-based only) The ASCT shall calculate offsets to suit the current coordination strategy for the user-specified reference point for each signal controller along a coordinated route within a group.

Demonstration

(Sequence-based only) The ASCT shall apply offsets for the user-specified reference point of each signal controller along a coordinated route.

Demonstration

(Sequence-based only) The ASCT shall calculate a cycle length for each cycle based on its optimization objectives (as required elsewhere, e.g., progression, queue management, equitable distribution of green).

Demonstration

(Sequence-based only) The ASCT shall limit cycle lengths to user-specified values.

Demonstration

(Sequence-based only) The ASCT shall limit cycle lengths to a user-specified range.

Demonstration

(Sequence-based only) The ASCT shall calculate optimum cycle length according to the user-specified coordination strategy.

Demonstration

(Sequence-based only) The ASCT shall limit changes in cycle length to not exceed a user-specified value.

Demonstration

(Sequence-based only) The ASCT shall increase the limit for the following XX cycles based on a change in conditions.

Demonstration

(Sequence-based only) The change in conditions shall be defined by XX successive adaptive increases in cycle length at the maximum rate.

Demonstration

(Sequence-based only) The increased limit shall be user-defined.

Demonstration

(Sequence-based only) The ASCT shall adjust offsets to minimize the chance of stopping vehicles approaching a signal that have been served by a user-specified phase at an upstream signal.

Demonstration

(Non-sequence-based only) The ASCT shall calculate the appropriate state of the signal to suit the current coordination strategy at the critical signal controller. (A critical signal controller is defined by the user.)

Demonstration

(Non-sequence-based only) At non-critical intersections within a group, the ASCT shall calculate the time at which a user-specified phase shall be green, relative to a reference point at the critical intersection, to suit the current coordination strategy.

Demonstration

(Non-sequence-based only) When demand is present, the ASCT shall implement a user-specified maximum time between successive displays of each phase at each intersection.

Demonstration

(Non-sequence-based only) The ASCT shall adjust signal timing so that vehicles approaching a signal that have been served during a user-specified phase at an upstream signal do not stop.

Demonstration

The ASCT shall calculate a cycle length of a single intersection, based on current measured traffic conditions. (The calculation is based on the optimization objectives.)

Demonstration

The ASCT shall calculate optimum phase lengths, based on current measured traffic conditions. (The calculation is based on the optimization objectives.)

Demonstration

The ASCT shall limit the difference between the length of a given phase and the length of the same phase during its next service to a user-specified value.

Demonstration

When queues are detected at user-specified locations, the ASCT shall execute user-specified timing plan/operational mode.

Demonstration

The ASCT shall calculate phase order, based on current measured traffic conditions. (The calculation is based on the optimization objectives.)

Demonstration

(Phase-based only) The ASCT shall alter the state of the signal controller for all phases at the user-specified intersection.

Demonstration

(Phase-based only) The ASCT shall calculate the time at which a user-specified phase shall be green at an intersection.

Demonstration

(Phase-based only) When demand is present, the ASCT shall implement a user-specified maximum time between successive displays of each phase at each intersection.

Demonstration

(Phase-based only) The ASCT shall alter the operation of the non-critical intersections to minimize stopping of traffic released from user-specified phases at the user-specified critical intersection.

Demonstration

(Phase-based only) The ASCT shall alter the operation of the non-critical intersections to minimize stopping of traffic arriving at user-specified phases at the user-specified critical intersection.

Demonstration

(Phase-based only) The ASCT shall adjust the state of the signal controller so that vehicles approaching a signal that have been served during a user-specified phase at an upstream signal do not stop.

Demonstration

The ASCT shall limit the change in consecutive cycle lengths to be less than a user-specified value.

Demonstration

The ASCT shall limit the change in phase times between consecutive cycles to be less than a user-specified value. (This does not apply to early gap-out or actuated phase skipping.)

Demonstration

The ASCT shall limit the changes in the direction of primary coordination to a user-specified frequency.

Demonstration

When a large change in traffic demand is detected, the ASCT shall respond more quickly than normal operation, subject to user-specified limits. (DEFINE 'MORE QUICKLY')

Demonstration

The ASCT shall select cycle length from a list of user-defined cycle lengths.

Demonstration

When specified by the user, the ASCT shall serve a vehicle phase more than once for each time the coordinated phase is served.

Demonstration

The ASCT shall provide a minimum of XX phase overlaps.

Demonstration

The ASCT shall accommodate a minimum of XX phases at each signal

Demonstration

The ASCT shall accommodate a minimum of XX rings at each signal.

Demonstration

The ASCT shall accommodate a minimum of XX phases per ring

Demonstration

The ASCT shall provide a minimum of XX different user-defined phase sequences for each signal.

Demonstration

Each permissible phase sequence shall be user-assignable to any signal timing plan.

Demonstration

Each permissible phase sequence shall be executable by a time of day schedule.

Demonstration

Each permissible phase sequence shall be executable based on measured traffic conditions

Demonstration

The ASCT shall not prevent a phase/overlap output by time-of-day.

Demonstration

The ASCT shall not prevent a phase/overlap output based on an external input.

Demonstration

The ASCT shall not prevent the following phases to be designated as coordinated phases. (User to list all required phases.)

Demonstration

The ASCT shall have the option for a coordinated phase to be released early based on a user-definable point in the phase or cycle. (User select phase or cycle.)

Demonstration

The ASCT shall not prevent the controller from displaying flashing yellow arrow left turn or right turn. (SELECT AS APPLICABLE)

Demonstration

The ASCT shall not prevent the local signal controller from performing actuated phase control using XX extension/passage timers as assigned to user-specified vehicle detector input channels in the local controller.

Demonstration

The ASCT shall operate adaptively using user-specified detector channels.

Demonstration

When adaptive operation is used in conjunction with normal coordination, the ASCT shall not prevent a controller serving a cycle length different from the cycles used at adjacent intersections.

Demonstration

(Describe requirements to suit other custom controller features that must be accommodated.)

Demonstration

The ASCT shall operate adaptively with the following detector logic. (DESCRIBE THE CUSTOM LOGIC)

Demonstration

When a pedestrian phase is called, the ASCT shall execute pedestrian phases up to XX seconds before the vehicle green of the related vehicle phase.

Demonstration

When a pedestrian phase is called, the ASCT shall accommodate pedestrian crossing times during adaptive operations.

Demonstration

When a pedestrian phase is called, the ASCT shall accommodate pedestrian crossing times then resume adaptive operation.

Demonstration

The ASCT shall execute user-specified exclusive pedestrian phases during adaptive operation.

Demonstration

The ASCT shall execute pedestrian recall on user-defined phases in accordance with a time of day schedule.

Demonstration

The ASCT shall begin a non-coordinated phase later than its normal starting point within the cycle when all of the following conditions exist:

• The user enables this feature
• Sufficient time in the cycle remains to serve the minimum green times for the phase and the subsequent non-coordinated phases before the beginning of the coordinated phase
• The phase is called after its normal start time
• The associated pedestrian phase is not called

Demonstration

When specified by the user, the ASCT shall execute pedestrian recall on pedestrian phase adjacent to coordinated phases.

Demonstration

When the pedestrian phases are on recall, the ASCT shall accommodate pedestrian timing during adaptive operation.

Demonstration

The ASCT shall not inhibit negative vehicle and pedestrian phase timing.

Demonstration

The ASCT shall accommodate the following custom pedestrian features. (Specify the requirements in conjunction with their corresponding need.)

Demonstration

The ASCT shall set a specific state for each special function output based on the occupancy on a user-specified detector.

Demonstration

The ASCT shall set a specific state for each special function output based on the current cycle length.

Demonstration

The ASCT shall set a specific state for each special function output based on a time-of-day schedule.

Demonstration

The ASCT shall be compatible with the following detector technologies (agency to specify):

• Detector type A
• Detector type B
• Detector type C

Analysis

The ASCT vendor shall specify detector requirements.

Inspection/Analysis

Vendor shall specify required detector accuracy

Inspection/Analysis

Vendor shall specify required detector output latency

Inspection/Analysis

Vendor shall specify detection zone coverage

Inspection/Analysis

Vendor shall specify mounting requirements

Inspection/Analysis

Vendor shall specify installation requirements

Inspection/Analysis

Detectors verified against the provided requirements shall be deemed acceptable by the ASCT Vendor.

Inspection/Analysis

The Vendor shall be responsible to provide expected functionality using verified detectors.

Demonstration

The ASCT shall measure the length of queues to support the adaptive algorithm

Test

The measurement shall be made with sufficient precision to support the adaptive algorithm.

Test

The ASCT shall maintain adaptive operation at non-preempted intersections during railroad preemption.

Demonstration

The ASCT shall maintain adaptive operation at non-preempted intersections during emergency vehicle preemption.

Demonstration

The ASCT shall maintain adaptive operation at non-preempted intersections during Light Rail Transit preemption.

Demonstration

The ASCT shall resume adaptive control of signal controllers when preemptions are released.

Demonstration

The ASCT shall execute user-specified actions at non-preempted signal controllers during preemption. (E.g., inhibit a phase, activate a sign, display a message on a DMS)

Demonstration

The ASCT shall operate normally at non-preempted signal controllers when special functions are engaged by a preemption event. (Examples of such special functions are a phase omit, a phase maximum recall or a fire route.)

Demonstration

The ASCT shall release user-specified signal controllers to local control when one signal in a group is preempted.

Demonstration

The ASCT shall not prevent the local signal controller from operating in normally detected limited-service actuated mode during preemption.

Demonstration

The ASCT shall continue adaptive operations of a group when one of its signal controllers has a transit priority call.

Demonstration

The ASCT shall advance the start of a user-specified green phase in response to a transit priority call.

Demonstration

The advance of start of green phase shall be user-defined.

Demonstration

Adaptive operations shall continue during the advance of the start of green phase.

Demonstration

The ASCT shall delay the end of a green phase, in response to a priority call.

Demonstration

The delay of end of green phase shall be user-defined.

Demonstration

Adaptive operations shall continue during the delay of the end of green phase.

Demonstration

The ASCT shall permit at least XX exclusive transit phases.

Demonstration

Adaptive operations shall continue when there is an exclusive transit phase call.

Demonstration

The ASCT shall control vehicle phases independently of the following:

Demonstration

• LRT only phases

Demonstration

• Bus only phases

Demonstration

The ASCT shall interface with external bus transit priority system in the following fashion..... (explain the external system and refer to other interfaces as appropriate)

Demonstration

The ASCT shall interface with external light rail transit priority system in the following fashion..... (explain the external system and refer to other interfaces as appropriate)

Demonstration

The ASCT shall accept a transit priority call from:

• a signal controller/transit vehicle detector;
• an external system.

Demonstration

The system shall collect and store volume data for each detector.

Demonstration

The system shall collect and store occupancy data for each detector.

Demonstration

The system shall time stamp each detector actuation.

Demonstration

The system shall upload local controller logs by TSS Operator manual command.

Demonstration

The system shall upload local controller logs according to a time of day schedule.

Demonstration

The TSS shall collect and store phase data for every permitted phase, including the length of the phase split [This requirement may be superfluous in systems supported by high-resolution data. This requirement is intended to support legacy approaches to providing a split monitoring capability within traffic signal systems.]

Demonstration

The system shall collect and store the following logs in user-definable format:

Demonstration

Timing plan change

Demonstration

Signal phase change

Demonstration

Special function change

Demonstration

Coordination status change

Demonstration

Operating mode change

Demonstration

Equipment failure

Demonstration

Communications failure

Demonstration

Manual commands

Demonstration

Operator log-on

Demonstration

Operator log-off

Demonstration

Emergency vehicle preemption on-off

Demonstration

Transit priority request, on-off

Demonstration

Action sets

Demonstration

Database changes

Demonstration

The system shall store the logs, alarms, and reports for a user defined amount of time (at least (X) years) where they are easily accessible. [User specify]

Demonstration

The system shall automatically transfer all logs, alarms, and reports to an archive system.

Demonstration

The archive system shall store each log, alarm and report for a minimum of (X) years (USER SPECIFY).

Inspection

The system shall create alerts of the following events:

• Detector fault/failure
• Communication fault/failure
• Flash mode
• Preemption fault/failure
• Transit signal priority fault/failure
• Cabinet flash
• Cabinet door open
• Temperature out of range
• Adaptive Processor and Algorithms (Note: Only with adaptive operations)

Test

The system shall provide an alert of any discrepancies between the central controller database and the infield database for each controller.

Test

The system shall classify every alerts as critical, warning, and informational only, based user-specified rules.

Demonstration

The system shall alert TSS Operator via text message.

Demonstration

The system shall alert TSS Operator via email.

Demonstration

The system shall alert TSS Operator by message on TSS Operator's desktop.

Demonstration

The system shall create performance measure reports from the data in the controller logs, including the following:

• Split logs (average split times, percent max out and force offs, percent gap outs, percent skips)
• Detector health
• Coordination plans
• Pedestrian actuations
• Transit signal priority actuations
• Emergency vehicle preemption actuations
• Real time split reports (showing programmed and actual splits)

Demonstration

The system shall create standard reports [specify].

Demonstration

The system shall create user customizable reports.

Demonstration

The system shall create the reports for a user-specified period.

Demonstration

The system shall collect detector data consistent with the Indiana Traffic Signal High Resolution Data Logger Enumerations.

Demonstration

The system shall collect signal phase data consistent with the Indiana Traffic Signal High Resolution Data Logger Enumerations.

Demonstration

The system shall produce performance reports consistent with:

• Attached performance report document (USER SPECIFIED - attach)
• Purdue Pooled Fund Study

Demonstration

The ASCT shall report measures of current traffic conditions on which it bases signal state alterations.

Demonstration

The ASCT shall report all intermediate calculated values that are affected by calibration parameters.

Demonstration

The ASCT shall maintain a log of all signal state alterations directed by the ASCT.

Demonstration

The ASCT log shall include all events directed by the external inputs.

Demonstration

The ASCT log shall include all external output state changes.

Demonstration

The ASCT log shall include all actual parameter values that are subject to user-specified values.

Demonstration

The ASCT shall maintain the records in this ASCT log for XX period.

Demonstration

The ASCT shall archive the ASCT log in the following manner: (Specify format, frequency, etc., to suit your needs.)

Demonstration

The Performance Measurement Server shall retrieve and store high-resolution data from local traffic signal controllers. [This requires the agency to provide traffic signal controllers that store the high-resolution data, which are not covered by these Model Documents.

Demonstration

High-resolution data are defined by (specify details).

Demonstration

The Performance Measurement Server shall store uploaded high-resolution data for [specify timeframe].

Demonstration

The TSS shall not prevent the local controller from accessing local devices as needed to store high-resolution data.

Demonstration

The Performance Measurement Server shall process the collected and stored high resolution data to produce the following reports:

• Signal Measures Charts:
  • Approach Delay
  • Approach Speed
  • Approach Volume
  • Arrivals on Red
  • Pedestrian Delay
  • Preemption Details
  • Purdue Coordination Diagram
  • Purdue Link Pivot
  • Purdue Phase Termination
  • Purdue Split Failures
  • Split Monitor
  • Turning Movement
  • Yellow and Red Actuations
• Reports:
  • Usage

Demonstration

The TSS shall provide predefined reports of stored data for non-technical recipients in accordance with user-specified formats. (Specify report formats to accompany this requirement.)

Demonstration

The TSS shall display stored data that illustrate adaptive input data and output decisions. (This display will be used by the TSS Operator.)

Demonstration

The Performance Measurement Server shall provide the following reports:

• Signal Measures Charts:
  • Approach Delay
  • Approach Speed
  • Approach Volume
  • Arrivals on Red
  • Pedestrian Delay
  • Preemption Details
  • Purdue Coordination Diagram
  • Purdue Link Pivot
  • Purdue Phase Termination
  • Purdue Split Failures
  • Split Monitor
  • Turning Movement
  • Yellow and Red Actuations
• Reports:
  • Usage

Demonstration

Performance measurement reports shall be consistent with descriptions in ATSPM version 4.0 (or later) documentation.

Demonstration

The TSS (ASCT) shall provide traffic performance measurement using probe vehicle reports provided by an external service [specify].

Demonstration

The TSS (ASCT) shall provide traffic performance measurement using [specify alternative approaches not covered in other requirements].

Demonstration

The TSS shall provide configurable alerts to the TSS Operator based on traffic operational performance. (Specify alerts to accompany this requirement.)

Demonstration

The TSS (ASCT) shall support external interfaces according to the referenced interface control documents and the following detailed requirements. (Insert appropriate requirements that suit your needs. Interface data flows should be documented in your ITS

• Information layer protocol
• Application layer protocol
• Lower layer protocol
• Data aggregation
• Frequency of storage
• Frequency of reporting
• Duration of storage)

Analysis

The ASCT shall send operational data to XX external system. (Insert appropriate requirements that suit your needs.)

Demonstration

The ASCT shall send control data to the XX external system. (Insert appropriate requirements that suit your needs.)

Demonstration

The ASCT shall send monitoring data to the XX external system. (Insert appropriate requirements that suit your needs.)

Demonstration

The ASCT shall send coordination data to the XX external system. (Insert appropriate requirements that suit your needs.)

Demonstration

The ASCT shall send performance data to the XX external system. (Insert appropriate requirements that suit your needs.)

Demonstration

The ASCT shall receive commands from the XX external system.

Demonstration

The ASCT shall implement the following commands from the XX external system when commanded: (Edit as appropriate for your situation)

• Specified cycle length
• Specified direction of progression
• Specified adaptive strategy

Demonstration

The ASCT shall conform its operation to an external system's operation.

Demonstration

The ASCT shall alter its operation to minimize interruption of traffic entering the system. (This may be achieved via detection, with no direct connection to the other system.)

Demonstration

The ASCT shall operate a fixed cycle length to match the cycle length of an adjacent system.

Demonstration

The ASCT shall alter its operation based on data received from another system.

Demonstration

The ASCT shall support adaptive coordination on crossing routes.

Demonstration

The ASCT shall set the state of external input/output states according to a time-of-day schedule.

Demonstration

The ASCT output states shall be settable according to a time-of-day schedule.

Demonstration

The ASCT shall implement the following commands from the XX external system when commanded: (Edit as appropriate for your situation)

• Specified cycle length

Demonstration

The ASCT shall conform its operation to an external system's operation.

Demonstration

The vendor's software shall be fully operational within the following platform: (edit as appropriate)

• Windows-PC,
• Linux,
• Mac-OS,
• Unix.

Demonstration

The ASCT shall fully satisfy all requirements when connected with detectors from manufacturer XX (specify required detector types).

Demonstration

The ASCT shall fully satisfy all requirements when connected with XX controllers (specify controller types).

Demonstration

The vendor shall provide training on all the operations of the system.

Demonstration

The vendor shall provide a minimum of XX hours of training to a minimum of XX staff. (SPECIFY)

Demonstration

The vendor shall provide a minimum of XX training sessions (specify how many sessions over what period).

Demonstration

The vendor shall provide the following training (edit as appropriate).

Demonstration

The vendor shall provide training on troubleshooting the system.

Demonstration

The vendor shall provide training on system configuration.

Demonstration

The vendor shall provide training on administration of the system.

Demonstration

The vendor shall provide training on the operations of the adaptive system.

Demonstration

The vendor shall provide training on the operations of the automated traffic signal performance measurement and monitoring.

Demonstration

The vendor shall provide training on system calibration.

Demonstration

The vendor's training delivery shall include: printed course materials and references, electronic copies of presentations and references.

Inspection

The vendor's training shall be delivered at (SPECIFY location for training).

Demonstration

The Maintenance Vendor shall provide maintenance according to a separate maintenance contract. That contract should identify repairs necessary to preserve requirements fulfillment, responsiveness in effecting those repairs, and all requirements on the maintenance provider while performing the repairs.

Inspection

The Vendor shall provide routine updates to the software and software environment necessary to preserve the fulfillment of requirements for a period of XX years. Preservation of requirements fulfillment especially includes all IT management requirements as previously identified.

Inspection

The Vendor shall warrant the system to be free of defects in materials and workmanship for a period of XX years. Warranty is defined as correcting defects in materials and workmanship (subject to other language included in the purchase documents). Defect is defined as any circumstance in which the material does not perform according to its specification.

Inspection