“One of the most treacherous things about a tire on ice is that you get a microfilm of water that builds up, which makes it very smooth,” Edmonds said. “There is no convincing evidence that studded tires increase fine sediment entering the lake,” said TRPA spokesman Dennis Oliver. (a) tyre traction devices of appropriate size used to prevent skidding on wet surfaces or on snow or ice. (b) tyres in which a wire is embedded which does not exceed a diameter of 0,075 inches and which are so designed that the proportion of metal in contact with the road surface does not in any case exceed 5 % of the total surface of the tyre in contact with the road surface, with the exception that, during the first 1 000 miles of use or operation of such a tyre, such a tyre is used for the first 1 000 miles; Metal in contact with the road surface may exceed 5 % of the surface of the tyre in contact with the road surface, but in no case shall it exceed 20 % of that surface. (c) rolling stock used on undeveloped lines where this is necessary for the construction or rehabilitation of motorways. (d) traction motors or tractors if they are used under the conditions of an authorization previously obtained by the Ministry of Transport. (e) tyres containing metal bolts of carbide or other suitable materials and used or constructed in such a way that the number of bolts or the proportion of metal in contact with the road surface between the first of November and 30 April does not in any case exceed 3 % of the total surface of the tyre in contact with the road; will be exceeded. The Commissioner may, after consultation with the Department of Transportation, extend the period during which studded tires may be used in any area of the State to protect the public due to adverse weather conditions. (f) tyres used in an approved emergency vehicle as defined in point 165 and containing metal pins of carbide or other suitable material, provided that the bolts are inserted or constructed in such a way that the number of bolts or the percentage of metal in contact with the road surface does not in any case exceed 3 % of the total surface of the tyre in contact with the road. Notwithstanding subsection (e), approved emergency vehicles are permitted to use studded tires without restriction throughout the year.
27450. When a vehicle is equipped with a solid rubber tyre, the solid rubber tyre shall have a minimum thickness of elastic rubber as follows: (a) If the width of the tyre is three inches but less than six inches, it shall be one inch thick. (b) If the width of the tyre is six inches, but not more than nine inches, 11/4 inches thick. (c) If the width of the tyre is more than nine inches, 11/2 inches thick. Yes. You must wear tire chains in your vehicle from November 1 to April 30, whether you use them or not. If CalTrans requires channel restrictions, you must comply with the channel requirements. See question 12 on chain control levels. 27451. The rubber of a solid rubber tyre shall be measured between the road surface and the metal part closest to the base flange to which the tyre is attached at the point where the concentrated weight of the vehicle on the road surface is loaded.
Must be equipped with tyre traction devices when entering a restricted area marked. In California, there are three requirements. First requirement (R1): Chains, traction devices or winter tires are required on the driving axle of all vehicles, with the exception of all-wheel drive and all-wheel drive vehicles. Second requirement (R2): Chains or traction devices are required for all vehicles, with the exception of all-wheel drive or all-wheel drive vehicles with snow tread tires on all four wheels. (NOTE: All-wheel drive vehicles shall carry traction devices in the chain control areas.) Requirement three (R3): Chains or traction devices are required on all vehicles, without exception. Trucks do not need to carry chains for a certain period of time. In order to simulate an icy road, tire carrier testers drove four rear-wheel drive 2006 BMW 325-I sedans and four different types of tires (three tips and one without studs) to an ice rink in 2006. They found that cars with studless winter tires had 1 to 15 percent more traction than the vehicle with spiked winter tires. 27460. Any passenger car or motor vehicle with an unladen weight of 6,500 pounds or less that is actuated and equipped with all-wheel drive tires and snow tread on the four-wheel drive may be operated on any part of a highway without tire traction devices, notwithstanding the fact that the highway is marked for the requirement of such devices and provided that the tire traction devices for at least one set of drive wheels in or on the Vehicle.