You arrive at an intersection with traffic lights that are not working because of a power outage. what do you do?

Treat the intersection like it has an 4-way stop sign.

When traffic signals are not working because of a power outage or other problem and not displaying any lights, you are required to stop, proceeding through the intersection as though it were an all-way stop. This does not apply if a law enforcement officer or other authorized person is directing traffic at the intersection, or if portable stop signs are in use