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.

If you've ever spotted white squares mounted near traffic lights, you may have wondered what they do. You might find their ...

Other states use ramp metering to reduce crashes, improve travel times and control the flow of traffic entering the freeway. The ramp meters will be used when traffic is slower and congested. They ...

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 ...