The director and each officer and inspector of the department designated by the director have general police powers with respect to enforcement of all laws pertaining to the use of motor vehicles and trailers, other than passenger cars and motorcycles, upon the highways, roads, and streets of this state and may:
1. Classify highways and enforce limitations as to weight and load of vehicles thereon as provided for under section 39-12-01.2. Issue special written permits authorizing the operation of oversized or overweight vehicles as provided for under section 39-12-02.3. Prohibit the operation or may impose restrictions on vehicular use of highways during certain seasons of the year as provided for under section 39-12-03.