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You should always let others know when you are turning, changing lanes or stopping.
Communicating your intentions not only makes your ride safer, but it is also required by law in the United States.
Left Turn: Fully extend your left arm out to the side
Right Turn: Fully extend your right arm out to the side or bend your left arm up at a right angle with your hand flat.
Slowing or Stopping: Extend your left arm out at a right angle with your hand open