On a roadway divided into lanes, a vehicle shall be driven as nearly as practicable entirely within a single lane and may not be moved from such lane until the driver has first ascertained that such movement can be made with safety. A violation of this section is a Class 2 misdemeanor.

Source: SL 1961, ch 150 , § 1 (1); SL 1989, ch 255 , § 145.