Whenever any roadway has been divided into two or more clearly marked lanes for traffic in one direction, the following rules apply:
(a) A vehicle shall be driven as nearly as practical entirely within a single lane and shall not be moved from the lane until such movement can be made with reasonable safety.
(b) Official signs may be erected directing slow-moving traffic to use a designated lane or allocating specified lanes to traffic moving in the same direction, and drivers of vehicles shall obey the directions of the traffic device.
Cite this article: FindLaw.com - California Code, Vehicle Code - VEH § 21658 - last updated January 01, 2019 | https://codes.findlaw.com/ca/vehicle-code/veh-sect-21658.html
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