Question If a traffic signal light is not working, you must: Answers Stop, then proceed when safe. Stop before entering the intersection and let all other traffic go first. Slow down or stop, only if necessary. Explanation If a traffic signal is not working and no lights are showing, you should proceed cautiously as if the intersection is controlled by stop signs in all directions. Pass your DMV Written Test with flying colors Take me to the cheat sheet California This questions appears in the following tests: California Practice Test 31 California Practice Test 31