- (1) No more than three fixed axles may be allowed in any truck and trailer combination.
(2) Vehicles with variable load axles are limited as follows:
- (a) retractable or variable load suspension axles installed after January 1990 must be self-steering provided however, variable load suspension axles that are within 60 inches of a drive axle or are within 60 inches of a trailer axle, need not be self-steering;
- (b) no axle in a group with a retractable or VLS axle may exceed legal or bridge formula weight requirements, or the manufacturer's tire rating; and
- (c) controls for raising or lowering retractable or VLS axles may be located in the cab of the power unit. The pressure regulator valve must be positioned outside of the cab and be inaccessible from the driver's compartment.
(3)(a) A motor carrier carrying a non-divisible load may apply for an approved permit that provides an exemption from the this section.
- (b) When operating a vehicle or combination of vehicles equipped with VLS axles with a permit described under Subsection (3)(a), a motor carrier shall engage the VLS axles.
KEY: permits, safety regulations, size and weight, trucks
Date of Last Change: March 16, 2026
Notice of Continuation: April 30, 2024
Authorizing, and Implemented or Interpreted Law: 72-1-201; 72-7-406; 72-9-303; 41-1a-102; 41-1a-231; 41-1a-1206; 72-7-402; 72-7-404; 72-7-407; 72-9-301; 72-9-502