Title 49 › Subtitle SUBTITLE VI— MOTOR VEHICLE AND DRIVER PROGRAMS › Part B— COMMERCIAL › Chapter 311— COMMERCIAL MOTOR VEHICLE SAFETY › Subchapter II— LENGTH AND WIDTH LIMITATIONS › § 31113
States (except Hawaii) must not set or enforce a different width limit than 102 inches for commercial trucks on most Interstate highways, on Federal-aid highways with traffic lanes built to be at least 12 feet wide that the Transportation Secretary picks, and on certain Federal-aid Primary highways if the Secretary agrees it is safe. A State may keep any rule it had on April 6, 1983, that allowed vehicles wider than 102 inches until the State issues a new rule that follows this limit. A Federal-aid highway that was not listed by June 5, 1984 can only be added with the top State official’s agreement. Width measurements do not count safety or energy-saving devices the Transportation Secretary allows. A State can give special permits for vehicles wider than 102 inches. A State’s top official (for example, the governor) may ask the Transportation Secretary to exempt a short Interstate segment if 102 inches cannot be safely handled (except for buses). That request must follow local and nearby-State consultation, show safety evidence and alternative routes, allow public comment, and be decided by the Secretary within 120 days, who must publish any exemption.
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Transportation — Source: USLM XML via OLRC
Legislative History
Reference
Citation
49 U.S.C. § 31113
Title 49 — Transportation
Last Updated
Apr 5, 2026
Release point: 119-73not60