This Act may be cited as the Lowboy Auto Hauler Fairness Act of 2025.

Section 31111 of title 49, United States Code, is amended— (1) in subsection (a) by adding at the end the following: (8) Lowboy trailer The term lowboy trailer means a semitrailer with a depressed section between the hitch and the first rear axle that is used specifically for the transport of assembled highway vehicles.; (2) in subsection (b)(1)— (A) in subparagraph (G), by striking or; (B) in subparagraph (H), by striking the period and inserting; or; and (C) by adding at the end the following: (I) imposes a vehicle length limitation of less than 80 feet on a truck tractor-lowboy trailer combination with a front overhang of less than 4 feet between the rear of the truck-tractor and the front of the lowboy trailer and a rear overhang of less than 6 feet, regardless of whether the truck-tractor is or is not capable of carrying cargo for the lowboy trailer to use the front and rear overhang.; and (3) by adding at the end the following: (h) Exception for lowboy trailers Lowboy trailers shall be exempt from the rear overhang flag requirements of section 393.87 of title 49, Code of Federal Regulations..