Road tractor.

"Road tractor" includes every motor vehicle designed and used primarily as a road building vehicle in drawing road building machinery and devices.

[1961 c 12 § 46.04.490. Prior: 1959 c 49 § 53; prior: (i) 1943 c 153 § 1, part; 1937 c 188 § 1, part; Rem. Supp. 1943 § 6312-1, part. (ii) 1937 c 189 § 1, part; RRS § 6360-1, part.]