3 ms·

You'd think so, but people have been prosecuted for warning other drivers about them.

• hkt 6y ago
  Source?
  • leetrout 6y ago
    For the US see https://en.m.wikipedia.org/wiki/Headlight_flashing#United_States https://en.m.wikipedia.org/wiki/Headlight_flashing#United_St...
  • ta988 6y ago
    In US it depends on states: https://www.findcarmeets.com/is-flashing-headlights-to-warn-of-speed-traps-legal/ https://www.findcarmeets.com/is-flashing-headlights-to-warn-...
  • petercooper 6y ago
    https://www.express.co.uk/life-style/cars/1118798/speed-trap-warning-obstructing-police-officer-fine-driving-law https://www.express.co.uk/life-style/cars/1118798/speed-trap...