CA Veh Code Section 21209

(a)

No person shall drive a motor vehicle in a bicycle lane established on a roadway pursuant to Section 21207 except as follows:

(1)

To park where parking is permitted.

(2)

To enter or leave the roadway.

(3)

To prepare for a turn within a distance of 200 feet from the intersection.

(b)

This section does not prohibit the use of a motorized bicycle in a bicycle lane, pursuant to Section 21207.5, at a speed no greater than is reasonable or prudent, having due regard for visibility, traffic conditions, and the condition of the roadway surface of the bicycle lane, and in a manner which does not endanger the safety of bicyclists.