413-1. Regulations.
(a) No tire or track on any vehicle, trailer or tractor which is driven, propelled or moved upon any County highway shall have on its periphery any block, stud, flange, cleat, ridge, bead, or any other protuberance of metal or wood which projects beyond the traction surface of such tire or track.
(b) This section does not apply to the following:
(1) Tire chains of reasonable size used to prevent skidding when upon wet surfaces or when upon snow or ice.
(2) Pneumatic tires which have embedded therein wire not to exceed .075 inches in diameter and which are so constructed that under no conditions will the percentage of metal in contact with the roadway exceed five percent (5%) of the total tire area in contact with the roadway, except that during the first one thousand (1,000) miles of use or operation of any such tire, the metal in contact with the roadway may exceed five percent (5%) of the tire area in contact with the roadway, but shall in no event exceed twenty percent (20%) of such area.
(3) Vehicles, trailers and tractors when operated under the conditions of a permit first obtained from the Department of Public Works of the County of Humboldt. (Ord. 460, § 2, 8/20/1963)