What should you do if you approach a traffic signal that is not functioning?

When you approach a traffic signal that is not functioning, treating it as a four-way stop is the correct response. This means that all vehicles approaching the intersection must come to a complete stop, assess the situation, and yield to any vehicles that arrived first or to the vehicles on your right if you arrive simultaneously. This approach helps ensure safety and facilitates orderly traffic flow when signals are inoperative.

The other potential responses, such as driving cautiously without stopping, proceeding as if it's a green light, or ignoring the signal entirely, can lead to confusion and increase the likelihood of accidents. Traffic signals are designed to manage traffic flow and improve safety, and when they fail, following the rule of treating the intersection as a four-way stop allows drivers to navigate the intersection effectively and safely.