Use your eyes, your situational awareness and your best judgement. The traffic light is not god's word.

In my neighborhood there used to be a traffic light that would be red for a long time despite not usefully regulating any traffic whatsoever. It stopped traffic despite the fact no other traffic could possibly conflict with it. People realized this and routinely ran that light with zero consequences. At some point the city realized it too and redesigned the traffic controls so that the light would be green in this situation.