Flashing Headlights to Warn Other Drivers of Cops is Free Speech...
Truck drivers often signal each other to warn abou... ...le-flash their headlights when they just passed a police speed trap to warn other drivers in the oncoming lanes.... ...Gate, ticketing a driver for warning others of a police nearby is illegal because flashing headlights is...
https://www.neatorama.com/2014/04/12/Flashing-Headlights-to-Warn-Other-Drivers-of-Cops-is-Free-Speech/
