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Re:The origins of ‘horn ok please,’ India’s most ubiquitous ... by Daneel_ on Monday November 29, 2021 @10:19AM (#29380814)
There's two common motorcyclist signals for police: Either tapping the top of the helmet, or pointing up at the sky while moving your arm in a circle (to mime spinning police lights).

Other motorcyclist signs are sticking the left leg out to say thanks, holding your hand out and rapidly opening/closing it to say "you've left your indicator on", and pointing at dangerous spots on the ground like potholes, gravel, or other unseen hazards.

Re:The origins of ‘horn ok please,’ India’s most ubiquitous ... by VBprogrammer on Monday November 29, 2021 @12:20PM (#29382425)
Flapping your arm like a child pretending to be a bird is another I've seen warning of a speed trap (it's actually the hand signal for "I'm slowing down" back in the days that was relevant).