Adding a fourth light to traffic signals—in addition to red, green, and yellow—would shorten wait times at street corners for pedestrians, a new study shows. It would also improve traffic flow for ...

Researchers say the rise of more smart and connected vehicles on American roads could lead to big changes for traffic signals. The current U.S. traffic signal system has been in existence for more ...

Inductive loop detectors were introduced in the early 1960s and have been one of the most widely used sensors for traffic management on freeways, arterials, and intersections. These sensors are used ...