North Carolina General Statutes Chapter 20. Motor Vehicles § 20-122. Restrictions as to tire equipment

(a) No vehicle will be allowed to move on any public highway unless equipped with tires of rubber or other resilient material which depend upon compressed air, for support of a load, except by special permission of the Department of Transportation which may grant such special permits upon a showing of necessity. This subsection shall have no application to the movement of farm vehicles on highways.

(b) No tire on a vehicle moved on a highway shall have on its periphery any block, stud, flange, cleat or spike or any other protuberance of any material other than rubber which projects beyond the tread of the traction surface of the tire, except that it shall be permissible to use farm machinery with tires having protuberances which will not injure the highway and except, also, that it shall be permissible to use tire chains of reasonable proportions upon any vehicle when required for safety because of snow, ice or other conditions tending to cause a vehicle to slide or skid. It shall be permissible to use upon any vehicle for increased safety, regular and snow tires with studs which project beyond the tread of the traction surface of the tire not more than one sixteenth of an inch when compressed.

(c) The Department of Transportation or local authorities in their respective jurisdictions may, in their discretion, issue special permits authorizing the operation upon a highway of traction engines or tractors having movable tracks with transverse corrugation upon the periphery of such movable tracks or farm tractors or other farm machinery.

(d) It shall not be unlawful to drive farm tractors on dirt roads from farm to farm: Provided, in doing so they do not damage said dirt roads or interfere with traffic.