Priority signals above traffic lights aid emergency vehicles.

They're called preemption signals.

Installed to override traffic light operations.

Used for faster emergency response.

Emitter-device communication triggers green light.

Enhances safety by clearing paths for emergency vehicles.

Confirmation lights indicate signal preemption.

Steady light for same direction, flashing for different.

Various systems use line of sight, GPS, or radio signals.

GPS-equipped ambulances reduce response time.