Section 21970 Of Chapter 5. Pedestrians’ Rights And Duties From California Vehicle Code >> Division 11. >> Chapter 5.

. (a) No person may stop a vehicle unnecessarily in a manner that causes the vehicle to block a marked or unmarked crosswalk or sidewalk.
  (b) Subdivision (a) does not preclude the driver of a vehicle facing a steady circular red light from turning right or turning left from a one-way street onto a one-way street pursuant to subdivision (b) of Section 21453.