Section R. 247.171 - DefinitionsRule 1.
(1) "Reference standard studded tire" means size E 78-14, 4-ply, bias construction tubeless snow tire containing 90 studs (kennametal class III (16-3-585)) fixed in 6 rows around the tire with 15 studs in each row. This reference tire was chosen because it was that used in the wear tests reported in laboratory evaluation of pavement damage caused by studded tires, salt, and abrasive sand, final report, American oil company, project 6128, May 1971.(2) "Bias construction tire" means a pneumatic tire in which the ply cords extending to the beads are laid at alternate angles substantially less than 90 degrees to the centerline of the tread.(3) "Northern Lower Peninsula" means all counties whose southern boundaries are as far or farther north than the southern boundary of Missaukee county.Mich. Admin. Code R. 247.171