Cars that drive themselves are no longer just a concept you'd see in sci-fi movies imagining the near future. Companies like Waymo are already using self-driving cars, and you can ride in a robotaxi ...

They might be vertical, they might be horizontal, but otherwise, traffic lights have hardly changed in a hundred years. Red means stop, yellow means slow down, and green means go, a universal code ...

Traffic engineers are quietly working on a radical idea: adding a white signal to the familiar red, yellow, and green. Instead of signaling drivers directly, the extra light would tell humans when to ...

You may have noticed some traffic lights with a white light that works independently of the others. They're not for normal cars; here's what they're for.

Traffic lights have been with us since 1868, when the first gas-powered set was switched on in London. These lights used a semaphore system similar to those used by the railways of the day and ...