§ 21657
72 words·~1 min read·
/ca/vehicle-code/21657A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
The authorities in charge of any highway may designate any highway, roadway, part of a roadway, or specific lanes upon which vehicular traffic shall proceed in one direction at all or such times as shall be indicated by official traffic control devices. When a roadway has been so designated, a vehicle shall be driven only in the direction designated at all or such times as shall be indicated by traffic control devices.