Section 21662 Of Article 1. Driving On Right Side From California Vehicle Code >> Division 11. >> Chapter 3. >> Article 1.
21662
. The driver of a motor vehicle traveling through defiles or
canyons or upon mountain highways shall hold the motor vehicle under
control at all times and shall do the following when applicable:
(a) If the roadway has no marked centerline, the driver shall
drive as near the right-hand edge of the roadway as is reasonably
possible.
(b) If the roadway has insufficient width to permit a motor
vehicle to be driven entirely to the right of the center of the
roadway, the driver shall give audible warning with the horn of the
motor vehicle upon approaching any curve where the view is obstructed
within a distance of 200 feet along the highway.