How should a driver respond to a traffic signal that is not functioning?

When a traffic signal is not functioning, the appropriate response is to treat the intersection as a four-way stop. This means all drivers approaching the intersection should come to a complete stop, yield to any vehicles or pedestrians already in the intersection, and then proceed through the intersection in a safe and orderly manner.

This procedure helps prevent confusion and potential accidents at an intersection that typically relies on signals to dictate traffic flow. By treating it like a four-way stop, drivers can ensure that everyone is following the same set of rules, thus increasing safety for all road users.

The other options do not provide a clear or safe response to a malfunctioning traffic signal. Proceeding with caution while following normal traffic rules can lead to misunderstandings because the usual signal guidance is absent. Ignoring the signal altogether can create dangerous situations, as it disregards the potential hazards at the intersection. Turning around to find an alternate route may not always be feasible and could lead to unnecessary delays or confusion in traffic.