IC 9-21-8-11.5: Roadways divided into two or more clearly marked lanes; rules

Sec. 11.5. Whenever a roadway has been divided into two (2) or more clearly marked lanes for traffic, a vehicle:

(1) shall be driven as nearly as practicable entirely between the lines marking the single lane; and

(2) may not be moved from the lane until the person who drives the vehicle has first ascertained that the movement can be made with safety.