A car's brights are its headlights (= the powerful lights at the front) when they are brightest and aimed straight ahead.

You can't just go around driving with your brights on.

Brights can be hazardous for oncoming drivers.

I'm under the impression that more and more people are driving with their brights on.

Turn off your brights - there's another car coming in the opposite direction.

Her car automatically turns the brights on when they're needed.

See also: bright noun