The
California Vehicle Code recognizes several hand signals. In Davis they are mostly used by bicyclists.
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Left arm straight out — signals a left turn or lane change
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Left arm out, hand pointing up, or right arm straight out — signals a right hand turn
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Left arm down at 45 degrees — signals a stop
Other (unofficial) hand signals include:
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Raised middle finger — You nearly killed me because you were trying to get the yogurt out of the bottom of that cup, please pay more attention to driving
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Thumbs up — Thanks for putting that cup of yogurt down while you were driving and waiting for me to cross the street.
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Peace sign — general acknowledgement of each other's existence, or "thanks for letting me go first".
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