Sensors in the ground communicate with the traffic signals to constantly retime the signals based on road conditions. If more cars are coming in one direction, the direction with heavier traffic flow ...

Drivers experience billions of dollars in congestion costs at intersections every year. Improving traffic signal timing could ...

Traffic lights have been with us since 1868, when the first gas-powered set was switched on in London. These lights used a semaphore system similar to those used by the railways of the day and ...