Urban mobility problems demand clarity. Intersections remain the most common sites for crashes, congestion, and violations.

Red and green traffic lights have been around since the 1800s, when British traffic officers used to rotate gas lamps that burned red and green to control the movement of mostly horse-drawn vehicles.

A. Called an “enforcement light,” it helps the deputies who patrol your town nab red-light runners. “It’s a tool we give the (Orange County) Sheriff’s Department to help them to do their jobs,” said ...

Late at night, stopped at a traffic light, a driver notices lights on all lanes of travel except their own appear to change normally from red to green. Continuing their lawful wait through multiple ...

Most drivers can agree — having to sit at a red light when you are the only car around is frustrating. Now, the City of ...

Late night road users will be seeing red when they approach SE 28th on Powell. (Photo: City of Portland) The City of Portland is testing a new traffic signal technology that makes red lights the ...

European traffic lights show red and yellow at the same time to make clear that a red light is about to turn green. This ...