А говорили, что "у них" водители дисциплинированные, и фарами не мигают:
A federal judge in Missouri ruled this week held that drivers have a First Amendment right to flash their headlights to warn other motorists of nearby police and speed traps.
http://www.foxnews.com/politics/2014/02/05/federal-judge-rules-drivers-allowed-to-warn-other-motorists-speed-traps/