Los Angeles is first city to synchronize every streetlight, in an effort to combat its infamous traffic. Los Angeles has synchronized every one of its 4,500 traffic signals across 470 square miles. Endeavour through the streets of Los Angeles
According to Popsci:
Magnetic sensors in the road at every intersection send real-time updates about the traffic flow through fiber-optic cables to a bunker beneath downtown Los Angeles, where Edward Yu runs the network. The computer system, which runs software the city itself developed, analyzes the data and automatically makes second-by-second adjustments, adapting to changing conditions and using a trove of past data to predict where traffic could snarl, all without human involvement.