Whenever traffic at an intersection is alternately directed to proceed and to stop by the use of signals exhibiting colored lights or the words "Go", "Caution", "Wait" and "Stop" said lights and terms shall indicate as follows, except as provided in section 9-4-1 of this title.
(A) Green or "Go": Traffic facing the signal may proceed except that vehicular traffic shall yield the right of way to pedestrians and vehicles lawfully within a crosswalk or the intersection at the time the signal was exhibited.
(B) Yellow or "Caution" or "Wait", when shown following the green or "Go": Traffic facing the signal shall stop before entering the intersection unless so close to the intersection that a stop cannot be made in safety.
(C) Red or "Stop": Traffic facing the signal shall stop before entering the intersection and remain standing until green or "Go" is shown alone. (1972 Code)