What is the proper response if you encounter a traffic signal that is not working?

When encountering a traffic signal that is not working, the proper response is to treat the intersection as a four-way stop. This means that all vehicles must come to a complete stop before proceeding. Each driver then must yield the right-of-way to the vehicle on their right if both arrive at the intersection simultaneously. This rule is in place to ensure safety and order in situations where traffic signals are malfunctioning, preventing confusion and potential accidents.

The other responses do not prioritize safety in the same way. Continuing through the intersection does not allow for proper yield and can lead to collisions. Driving cautiously but without stopping may not ensure that all drivers are aware of their surroundings, and thus may also cause accidents. Following the last color displayed could lead to misunderstandings about who has the right of way, especially if other vehicles are present. Treating the situation as a four-way stop effectively mitigates risks by ensuring that each driver takes responsibility for their actions before proceeding.