Questions and Answers About Vehicle Size and Weight

Notice: These guidances interpret Federal law and regulations governing weight limits on the interstate system and size requirements on the national network. In case of dispute, the actual law and regulations apply.

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23 CFR 657.15 Certification requirements
23 CFR 657.19 Effect of failure to certify or enforce State laws adequately, and 49 U.S.C. 31115 Failure to incorporate Federal size requirements into State laws
23 CFR 657.21 Procedure for reduction of funds
23 CFR 658.11 Additions, deletions, exceptions, and restrictions (to National Network)
23 CFR 658.13 Length
23 CFR 658.13(e) Specialized equipment
23 CFR 658.15 Width
23 CFR 658.16 Exclusion from length and width determinations
23 CFR 658.17 Weight
23 CFR 658.19 Reasonable Access
23 CFR 658.23 LCV freeze; cargo carrying unit freeze (ISTEA freeze)
23 CFR 658.5 Definitions
23 CFR 658.9 National Network Criteria
Miscellaneous