The city of Roswell is installing emergency vehicle preemption technology at all 107 of its traffic lights. The city’s system by Alpharetta-based Applied Information speeds up emergency response times ...

Engineers are exploring a future white phase on U.S. traffic lights, showing how autonomous vehicles could coordinate movement at intersections.

Late at night, stopped at a traffic light, a driver notices lights on all lanes of travel except their own appear to change ...

KNOX COUNTY, Tenn. — There are 91 traffic signals in Knox County with more on the way. Have you ever wondered how those lights know when to change and who makes sure they work? In part, it's up to ...

Fresnel lenses are designed so their light can be pointed in just one direction, meaning drivers in a lane may see only the ...

If you've ever wondered how traffic lights work and how they can detect your car, you've probably also been curious about those small blue lights mounted above the signals themselves. These blue ...

A nearly $30 million investment will go to communities all across Pennsylvania as part of the Green Light-Go Program. According to PennDOT, it's a reimbursement grant program that will see ...