Red and green traffic lights have been around since the 1800s, when British traffic officers used to rotate gas lamps that ...

Traffic signal projects at eight intersections in Berks County have received state grant funding. Gov. Josh Shapiro’s administration announced Wednesday that a total of 73 municipalities across ...

The first "municipal traffic control system" appeared in Cleveland in 1914, according to Smithsonian Magazine. At first, there was just green and red, with the yellow light added a few years later.