Traffic lights are so ubiquitous that we hardly give them a second thought, except to curse their existence when they impede us on our daily drive. But no matter how much it seems like traffic ...

to thank for the yellow light, but as a municipal employee he could not patent his invention. By 1930, all major American cities and many small towns had at least one electric traffic signal ...

The shrouded standards hang near traffic lights that they'll eventually replace. But until that happens, they're covered to ...