Ringing your bell is something I am conditioned to hearing and associate with a bicycle. Yelling "on your left" IMHO is a problem creator. I associate a loud human voice as danger but my next instinct is to figure out what was said. The lack of instantly understanding what was said my mind interprets as danger to me - not you. At that instant my natural defence kicks in like duck or swerve. That puts you or I in more danger than before the yell.
Hey I just invented a new saying - DON'T YELL GET A BELL !
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