flash one's headlights

Satisfied they were alone, he flashed his headlights three times.

I flashed my headlights and the one on the left gradually pulled ahead.

Friedman flashed the car's headlights as they pulled past me.

On a particularly dark, almost deserted road, the officer began flashing his headlights.

He almost ruined it by parking right up behind me and flashing his headlights once.

The big car had finally tired of following and was flashing its headlights, ordering them to pull over.

The first car entered the parking lot and signaled the others by flashing headlights.

In the other lane a red van approached, and the driver was flashing his headlights.

When nothing happened, he honked the horn, and flashed his headlights.

Some flash their headlights at other cars or flick the interior light on briefly.