Final answer:
A traffic signal blackout occurs when the traffic signal light is not working. Drivers should treat the intersection as a four-way stop and follow the right-of-way rules.
Step-by-step explanation:
A traffic signal blackout occurs when the traffic signal light is not working due to a power outage or malfunction. During a blackout, drivers should treat the intersection as a four-way stop and follow the right-of-way rules. This means that if two vehicles arrive at the intersection simultaneously, the driver on the right has the right-of-way. If all drivers follow these rules, it can help reduce accidents and maintain traffic flow.