4511.33

A) Whenever any roadway has been divided into two or more clearly marked lanes for traffic, or wherever within municipal corporations traffic is lawfully moving in two or more substantially continuous lines in the same direction, the following rules apply:

(1) A vehicle or trackless trolley shall be driven, as nearly as is practicable, entirely within a single lane or line of traffic and shall not be moved from such lane or line until the driver has first ascertained that such movement can be made with safety.