Title 49 › SUBTITLE VI — MOTOR VEHICLE AND DRIVER PROGRAMS › PART B — COMMERCIAL › CHAPTER 311 — COMMERCIAL MOTOR VEHICLE SAFETY › SUBCHAPTER II — LENGTH AND WIDTH LIMITATIONS › § 31113
Limits how wide commercial trucks and other commercial vehicles can be on many federal highways. States (except Hawaii) may not set a rule that lets trucks be wider or narrower than 102 inches on most Interstate highways, on Federal-aid highways with lanes designed to be at least 12 feet wide, or on certain Federal-aid Primary System roads if the U.S. Transportation Secretary agrees it is safe. Measurements do not count safety or energy-saving devices the Secretary approves. A State can still issue a special permit for a vehicle over 102 inches, and a State may keep a wider rule that was already in effect on April 6, 1983 until it updates the rule. A Federal-aid highway not listed by June 5, 1984 can only be added with the State’s top official’s agreement. A State’s top official (for example, the governor) can ask the Secretary to exempt a short Interstate segment if it cannot safely handle 102-inch vehicles (buses are excluded). Before asking, the official must talk with local governments and any neighboring State that might be affected and look at alternate routes. The request must show evidence of safety problems and the consultation results. The Secretary must give notice, allow public comment, and decide within 120 days or tell Congress why more time is needed. Approved exemptions are added into the federal rules.
Full Legal Text
Transportation, Source: USLM XML via OLRC
Legislative History
Reference
Citation
49 U.S.C. § 31113
Title 49, Transportation
Last Updated
Sep 22, 2026
Release point: 119-110