Congestion wastes gas
The U.S. Treasury Department estimates that traffic congestion wastes 1.9 billion gallons of gas and costs American drivers $100 billion a year in lost fuel and time. With more than 311,000 traffic lights in the country, every second sitting at red lights adds up.
This is an aerial view of Always Green Traffic Control at an intersection northward and eastward traffic flows are 2650 vehicles per hour. Southward and Westward are 850 vph. This is peak flow & very heavy traffic.