As a reminder:
§ 3112. Traffic-control signals.
(a) General rule.--Whenever traffic is controlled by traffic-control signals exhibiting different colored lights, or colored lighted arrows, successively one at a time or in combination, only the colors green, red and yellow shall be used, except for special pedestrian signals carrying a word legend, and the lights shall indicate and apply to drivers of vehicles and pedestrians as follows:
(c) Inoperable or malfunctioning signal.--If a traffic-control signal is out of operation or is not functioning properly, including, but not limited to, a signal that uses inductive loop sensors or other automated technology to detect the presence of vehicles that fails to detect a vehicle, vehicular traffic facing a:
(2) Red or completely unlighted signal shall stop in the same manner as at a stop sign, and the right to proceed shall be subject to the rules applicable after making a stop at a stop sign as provided in section 3323 (relating to stop signs and yield signs).