Traffic lights today are controlled by computers and other purpose-built systems, but what did people do before computers ...

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 ...

A sideways traffic light might look strange at first, but it’s fully functional and intentional. In several U.S. states, horizontal traffic lights are the standard. They display the same red, yellow, ...

The sensors can prioritize cyclists or pedestrians so they don't need to wait—and help cities more quickly identify dangerous ...