What happens to the traffic lights when there is a power cut?

When there is a power cut, traffic lights typically go out, which can lead to confusion and potential traffic hazards at intersections. The response to this situation can vary depending on the location and available infrastructure:

1. Manual Traffic Control: In some places, police officers or traffic wardens are dispatched to manually direct traffic until power is restored.
2. Battery Backup Systems: Many modern traffic lights are equipped with battery backup systems that can keep them operational for a limited period during a power outage. These systems usually provide power for a few hours.
3. Solar Power: Some traffic lights are supplemented with solar panels, which can provide an alternative power source during outages.
4. Flashing Mode: Some traffic lights may switch to a flashing mode if they have a backup power source. A flashing red light acts like a stop sign, and a flashing yellow light means proceed with caution.
5. Drivers Follow Basic Rules: In the absence of functioning traffic lights or manual control, drivers are generally expected to follow basic right-of-way rules, treating the intersection as a four-way stop.

The response and infrastructure available can significantly impact traffic flow and safety during a power cut.