1. (1) By issuing one or more traffic engineering orders, the department may designate traction segments and assign each designated traction segment as one of three classes.

2. (2) During adverse weather conditions or predicted adverse weather conditions, the associated traction requirements for each of the three classes of designated traction segments are as follows:

   1. (a) for a Class 1 traction segment, the department may require that each vehicle with a GVWR of 12,000 pounds or more be equipped with one of the following:

      1. (i) traction devices on all rear drive tires, except that traction devices are only required for one tire for each pair of dual-mounted drive tires; or
      2. (ii) all-wheel drive or four-wheel drive with M+S or 3PMSF tires.

   2. (b) for a class 2 traction segment, the department may require each vehicle to be equipped with one of the following:

      1. (i) traction devices on at least two drive tires, or if the vehicle has a GVWR of 12,000 pounds or more and does not have all-wheel or four-wheel drive, traction devices on all rear drive tires as described in Subsection (2)(a)(i);
      2. (ii) all-wheel or four-wheel drive with M+S or 3PMSF tires; or
      3. (iii) if the vehicle has a GVWR of less than 12,000 pounds, two-wheel drive with 3PMSF tires; and

   3. (c) for a class 3 traction segment, the department may require each vehicle to be equipped with one of the following:

      1. (i) traction devices on at least two drive tires, or if the vehicle has a GVWR of 12,000 or more and does not have all-wheel or four-wheel drive, traction devices on all rear drive tires as described in Subsection (2)(a)(i);
      2. (ii) all-wheel or four-wheel drive with M+S or 3PMSF tires with a minimum of 5/32 inch tread depth remaining on each tire; or
      3. (iii) if the vehicle has a GVWR of less than 12,000 pounds, two-wheel drive with 3PMFS tires with a minimum of 5/32 inch tread depth remaining on each tire.

3. (3) The department or a law enforcement agency may do any of the following:

   1. (a) restrict any vehicle from traveling on any designated traction segment that fails to comply with the requirements of Subsection (1);
   2. (b) restrict commercial vehicles from operating on a class 3 traction segment even if the commercial vehicle complies with the requirements of Subsection (1)(c);
   3. (c) operate a class 2 traction segment as a class 1 traction segment; and
   4. (d) operate a class 3 traction segment as a class 1 or class 2 traction segment.

4. (4)(a) To inform the public, the department shall maintain and publish on the department's website a list of each designated traction segment, including the class of each segment and where traction requirements will be in effect during adverse weather conditions and predicted adverse weather conditions.

   1. (b) The department shall provide information regarding each designated traction segment, including the class of each segment, to:

      1. (i) the Utah Highway Patrol;
      2. (ii) relevant county offices; and
      3. (iii) relevant local law enforcement agencies.

KEY: traction device requirements, adverse weather conditions

Date of Last Change: October 23, 2025

Notice of Continuation: June 22, 2022

Authorizing, and Implemented or Interpreted Law: 41-6a-715