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head taps?

• datax2 1y ago
  on a motorcycle when you pass a cop you tap your helmet to warn other riders.
  • chrisweekly 1y ago
    thanks. and yikes! I've been a motorcycle rider for over a decade, many thousands of miles, now on my 3rd bike -- and somehow I'm just now learning this.
• ggreer 1y ago
  People on motorcycles signal "police ahead" to riders in the opposite direction by reaching up with their left hand and tapping their head/helmet.