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California Vehicle Code
21650. Upon all highways, a vehicle shall be driven upon the right half of the roadway, except as follows: (a) When overtaking and passing another vehicle proceeding in the same direction under the rules governing that movement. (b) When placing a vehicle in a lawful position for, and when the vehicle is lawfully making, a left turn. (c) When the right half of a roadway is closed to traffic under construction or repair. (d) Upon a roadway restricted to one-way traffic. (e) When the roadway is not of sufficient width. (f) When the vehicle is necessarily traveling so slowly as to impede the normal movement of traffic, that portion of the highway adjacent to the right edge of the roadway may be utilized temporarily when in a condition permitting safe operation. (g) This section does not prohibit the operation of bicycles on any shoulder of a highway, where the operation is not otherwise prohibited by this code or local ordinance.
21654. (a) Notwithstanding the prima facie speed limits, any vehicle proceeding upon a highway at a speed less than the normal speed of traffic moving in the same direction at such time shall be driven in the right-hand lane for traffic or as close as practicable to the right-hand edge or curb, except when overtaking and passing another vehicle proceeding in the same direction or when preparing for a left turn at an intersection or into a private road or driveway. (b) If a vehicle is being driven at a speed less than the normal speed of traffic moving in the same direction at such time, and is not being driven in the right-hand lane for traffic or as close as practicable to the right-hand edge or curb, it shall constitute prima facie evidence that the driver is operating the vehicle in violation of subdivision (a) of this section. (c) The Department of Transportation, with respect to state highways, and local authorities, with respect to highways under their jurisdiction, may place and maintain upon highways official signs directing slow-moving traffic to use the right-hand traffic lane except when overtaking and passing another vehicle or preparing for a left turn.
21753. Except when passing on the right is permitted, the driver of an overtaken vehicle shall safely move to the right-hand side of the highway in favor of the overtaking vehicle after an audible signal or a momentary flash of headlights by the overtaking vehicle, and shall not increase the speed of his or her vehicle until completely passed by the overtaking vehicle. This section does not require the driver of an overtaken vehicle to drive on the shoulder of the highway in order to allow the overtaking vehicle to pass.
21754. The driver of a motor vehicle may overtake and pass to the right of another vehicle only under the following conditions: (a) When the vehicle overtaken is making or about to make a left turn. (b) Upon a highway within a business or residence district with unobstructed pavement of sufficient width for two or more lines of moving vehicles in the direction of travel. (c) Upon any highway outside of a business or residence district with unobstructed pavement of sufficient width and clearly marked for two or more lines of moving traffic in the direction of travel. (d) Upon a one-way street. (e) Upon a highway divided into two roadways where traffic is restricted to one direction upon each of such roadways. The provisions of this section shall not relieve the driver of a slow moving vehicle from the duty to drive as closely as practicable to the right hand edge of the roadway.
21758. In the event any vehicle is being operated on any grade outside of a business or residence district at a speed of less than 20 miles per hour, no person operating any other motor vehicle shall attempt to overtake and pass such slow moving vehicle unless the overtaking vehicle is operated at a speed of at least 10 miles per hour in excess of the speed of the overtaken vehicle, nor unless the passing movement is completed within a total distance not greater than one-quarter of a mile.