Pittsburgh cuts travel time by 25% with smart traffic lights

Pittsburgh is slashing emissions and journey times by using real time traffic flow data to determine when traffic lights should go red or green. Each intersection builds and updates its own lighting plan every few seconds by using camera and radar data to calculate where vehicles are, when they will reach an intersection and how long it will take them to pass through it. Traffic is logged in time-sequenced clusters of vehicles, rather than as individual cars, allowing the system to accurately monitor flow, which is then passed on to adjacent intersections.