The SONEM 2000 has changed signal priority for good.
The system´s detector detects the siren of an oncoming emergency vehicle and then...
1.- Determines the direction of the approaching vehicle
2.- Notifies the traffic controller of a request for a priority
3.- Clears the priority request once the vehicle has passed through the intersection

Detects the Emergency Vehicle Siren
Simple to deploy. Install it, tweak it and you´re done.
Hassle free. No lenses to clean.
Lower cost. No costly vehicle retrofitting.

Find out more information at RGH Pacific Emergency Services Inc.