Elon Musk has perpetually promised that self-driving cars are only a year away. However, today's relatively rudimentary autonomous systems are still making errors that most humans wouldn't make behind ...

Sometimes, drivers will flash oncoming cars to warn them of a hidden police car up ahead so that they can slow down and avoid a potential traffic ticket. Is it legal?

Ponder the red-backed poison frog. In nature, red can issue a warning to predators — stay away, the aposematic message reads. On the road, red can be a warning of its own, often flashing on emergency ...

When a lighted intersection isn’t functioning properly, the lights for one set of lanes typically begin flashing red, and the adjacent set of lights typically begin flashing yellow. Knowing what to do ...