After a successful trial run of a system that allows devices on emergency vehicles to control traffic signals while on ...

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 ...

Red, yellow and green have become the universal symbols for stop, slow and go – but what does white mean? Researchers from North Carolina State University proposed adding a new color, white, to ...