All traffic lights use the same idea. Real traffic lights use cameras (we used 2 light sensors to make a light gate) to detect oncoming traffic. Real traffic lights, tell people when they should stop their car. Our traffic lights sent an infrared message to the other robot car to STOP, GO & WAIT.

The two light sensors detect the car, put the lights on red, and then sends a infra red RCX code message to order the car to STOP!

The car waits patiently at amber, waiting for red, then green.

The one on the left shows a close up of the three lights. The one on the right shows a shot of just the lights. We also fitted a siren to the the red light, so when it went red, the siren went off, telling people to cross the road.

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