Tennessee Studded Tires: Legal October 1 Through April 15

Section 55-9-106 sits in Title 55, Chapter 9, Part 1, the general provisions of Tennessee's equipment and lighting rules, and it is the whole of Tennessee's tire traction law. A full text search of the Tennessee Code returns no section using the phrase "snow tires" and none using "traction devices"; the only hit for "studded tires" is this section. Anything a Tennessee driver needs to know about metal studs is inside these four subsections.

The structure is a flat prohibition followed by one seasonal exception. Subsection (a) forbids using a tire on a highway that carries, on its periphery, any block, stud, flange, cleat or spike, or any other protuberance of a material other than rubber, projecting beyond the tread of the traction surface. Subsection (b) then permits a tire with wire or other material imbedded in it "for improving traction on snow and ice" during the period October 1 through April 15. That is six months and fifteen days of lawful stud use, and the remaining five and a half months are governed by the ban in subsection (a).

The season is a single statewide date pair. Subsection (b) names no county, no elevation band, no mountain route and no Grand Division, so the same October 1 opening applies on Roan Mountain in Carter County and in Shelby County. That was a choice, not an oversight: elsewhere in the same title the General Assembly writes highly localised vehicle rules, listing named state routes in Scott, Anderson, Unicoi, Fentress, Perry and Hickman counties in § 55-8-185(f) and using a population bracket 100 people wide in § 55-8-210. Nothing of that kind appears in the studded tire section.

Two numeric limits control how aggressive the studs may be. After the first 1,000 miles of use or operation, the wire or other material in contact with the roadway may not exceed 5 percent of the total tire area in contact with the roadway. During those first 1,000 miles, while a new stud still stands proud of an unworn tread, the allowance is 20 percent. A tire that never wears down to the 5 percent figure stops being lawful at 1,001 miles even though the season is still open.

Weight is the other cut off. Studded tires allowed by subsection (b) "shall not be used at any time" on a vehicle with a maximum gross weight of more than 9,000 pounds, unless the vehicle is a school bus or an emergency vehicle. Three quarter ton pickups and most passenger vehicles sit under that ceiling; loaded one ton trucks, box trucks and RVs generally do not, which means a Tennessee motorhome owner cannot legally stud the drive tires even in January.

Two alternatives stay open all year. Subsection (c) permits tire chains of reasonable proportions on any vehicle when required for safety because of snow, ice or other condition tending to cause a vehicle to skid, with no calendar limit attached, so chains are the lawful answer to a late April or early September ice event that falls outside the stud season. Subsection (d) permits farm machinery with protuberant tires provided the protuberances will not injure a highway.

Section 55-9-106 states no penalty of its own, and that is worth understanding before treating the section as toothless. Tennessee's general traffic penalty, Tenn. § 55-8-103, makes it a Class C misdemeanor to do any act forbidden or fail to perform any act required "in this chapter and chapter 10 of this title"; by its own terms it does not reach Chapter 9, where the tire rule lives. Where the General Assembly wanted a stated penalty for an equipment rule it wrote one in expressly, as it did in § 55-4-110(e) for registration plate display and in § 55-8-185(i) for utility terrain vehicles.

Under § 40-35-111(e)(3) a Class C misdemeanor in Tennessee carries up to 30 days and a fine of up to $50. Subsection (a) is still drafted as an absolute bar on use, so a set of studs mounted in June is unlawful equipment on a Tennessee highway regardless of what fine is or is not scheduled, and the practical exposure is a stop and an order to correct the equipment. There is no permit, sticker or registration step for studded tires in Tennessee: the season and the percentage limits are self executing, and a tire shop mounting studs for a customer is working to the same two numbers.