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A small town is piloting an experimental traffic light control system aimed at improving emergency vehicle response times. To help emergency vehicle drivers pass traffic lights more quickly, devices have been installed on traffic lights as well as embedded in the town’s emergency vehicle navigation systems (police, fire & ambulance). The traffic light devices use Radio Frequency (RF) signals sent from the in-car devices to identify each vehicle. When authorised in-car devices are manually triggered, those traffic lights within range which govern the vehicle’s forward motion are signalled to as quickly as possible safely switch to green.
Outline how, upon receiving a change signal from an authorised emergency vehicle, the sensors, actuators and microprocessors on the traffic light devices operate.

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