In subsection (a), the words “a vehicle consisting” are substituted for “any combination” for clarity. The words “Dwight D. Eisenhower System of Interstate and Defense Highways” are substituted for “National System of Interstate and Defense Highways” because of the Act of October 15, 1990 (Public Law 101–427,
104 Stat. 927).
In subsection (b), the words “Not later than 60 days after the date of the enactment of this Act, the Secretary shall initiate a rulemaking proceeding” are omitted as executed.