1. (1) "3PMSF" means three-peak mountain snowflake, which is a tire designation indicating the tire is designed to offer a higher level of snow traction than a standard or M+S tire.
2. (2) "Adverse weather conditions" means weather that, as determined by the department, may make driving more hazardous or increase the risk of crashes on state highways because of decreased traction, reduced visibility, or other factors.
3. (3) "All-wheel drive" means a vehicle that provides power to all wheels of the vehicle.
4. (4) "Designated traction segment" means a section of a state highway where the department is authorized to enact traction device requirements during adverse weather conditions or predicted adverse weather conditions.
5. (5) "Drive tire" means a tire on a vehicle's wheel that is attached to an axle that transmits power to the wheel.
6. (6) "GVWR" means gross vehicle weight rating, which represents the maximum weight a vehicle is designed to safely carry, including the vehicle's weight, cargo, and fuel.
7. (7) "Four-wheel drive" means a vehicle that provides power to all wheels of the vehicle.
8. (8) "M+S" means a tire designation indicating the tire is designed to offer improved traction in mud and snow compared to a standard tire.
9. (9) "Predicted adverse weather conditions" means forecast adverse weather conditions that, as determined by the department, are likely to exist or begin during a 24-hour period.
10. (10) "Snow socks" means a fabric-based cover that wraps around a tire to provide increased tire traction on snow or ice.
11. (11) "Tire chains" means metal chains or cables that provide increased tire traction on snow or ice.
12. (12) "Tire studs" means small metal pins that are embedded in a tire's tread to provide grip on snow or ice.
13. (13) "Traction devices" means tire chains, tire studs, or snow socks.

14. (14)(a) "Traffic control device" means the same as that term is defined in Section 41-6a-102.

    1. (b) "Traffic control device" includes an electronic sign or other notification device that provides information regarding adverse weather conditions, predicted adverse weather conditions, or notice that traction requirements are in effect on a state highway.
15. (15) "Traffic engineering order" means a document issued by the department that establishes or modifies regulations, restrictions, or conditions related to traffic on state highways.
16. (16) "Traction requirements" mean the requirements described in Section R920-6-3.
17. (17) "Two-wheel drive" means a vehicle that provides power to only two wheels of the vehicle.

As used in this rule:

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