Originally Posted by
79pmooney
I see roadies doing that on low-handlebarred road bikes. With their backs close to horizontal, only the birds have any clue what they are indicating. The right arm straight point is so much clearer that it baffles me why anyone would be taught otherwise (though I was taught I could use either 50 something years ago).
See
Hand signals? for the reason. Other posters have mentioned their quixotic quest to "teach" motorists about hand signals that were last in vogue and maybe understood by the general public over 60 years ago.
Something about bicycling seems to bring out the latent OCD tendencies of some enthusiasts.