(a) At each intersection where an automatic signal system is in operation, all vehicular and pedestrian traffic crossing such street intersection shall be governed by such automatic signal system.
(1) Red signal light. The display of the red signal light shall be a signal for traffic to stop outside of the street intersection, except as otherwise provided in Section 430.16(b).
(2) Yellow signal light. The display of the yellow signal light shall indicate that traffic is to be at attention for movement until the green light is displayed.
(3) Green signal light. The green signal light shall be a signal for traffic to promptly move forward.
(b) No person shall violate or fail to comply with any such signal.
(1958 Code § 16.38)