Section 21451 Of Article 3. Offenses Relating To Traffic Devices From California Vehicle Code >> Division 11. >> Chapter 2. >> Article 3.

. (a) A driver facing a circular green signal shall proceed straight through or turn right or left or make a U-turn unless a sign prohibits a U-turn. Any driver, including one turning, shall yield the right-of-way to other traffic and to pedestrians lawfully within the intersection or an adjacent crosswalk.
  (b) A driver facing a green arrow signal, shown alone or in combination with another indication, shall enter the intersection only to make the movement indicated by that green arrow or any other movement that is permitted by other indications shown at the same time. A driver facing a left green arrow may also make a U-turn unless prohibited by a sign. A driver shall yield the right-of-way to other traffic and to pedestrians lawfully within the intersection or an adjacent crosswalk.
  (c) A pedestrian facing a circular green signal, unless prohibited by sign or otherwise directed by a pedestrian control signal as provided in Section 21456, may proceed across the roadway within any marked or unmarked crosswalk, but shall yield the right-of-way to vehicles lawfully within the intersection at the time that signal is first shown.
  (d) A pedestrian facing a green arrow turn signal, unless otherwise directed by a pedestrian control signal as provided in Section 21456, shall not enter the roadway.