Why Do Traffic Lights Change on a Timer?
What It Is
Many traffic lights switch colors based on preset time intervals.
How It Works
The signal follows a programmed schedule.
Each light stays on for a set amount of time.
Why Timers Are Used
Timers provide predictable traffic flow.
They are useful where traffic patterns are consistent.
When Sensors Aren’t Used
Some intersections lack vehicle sensors.
Timed signals work without detecting cars.
Common Examples
- Traffic lights late at night
- Signals in small towns
- Backup systems during sensor failure
What to Know Next
Many modern intersections combine timers with sensors.
Closing Summary
Traffic lights use timers to manage traffic flow when detection systems are limited or unnecessary.
