On flashing to warn of speed traps

Posted: August 23, 2014 at 3:26 a.m.

Dear Dudeness: Back in the 1950s and 1960s, even us kids knew the two rules of the road: All trash had to be thrown out the window, and the driver had to flash his headlights at oncoming traffic to warn about the policeman ahead. It's obvious the trash rule is still followed. Is the flashing still OK? -- Flashy Trasher

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