text: South Africa and Denmark Sudden reduction in speed requires the same signal as stopping, (i.e. the extending the right arm is horizontally with the palm facing downwards and the hand rotating up and down at the wrist, see Stopping section). The driver is also permitted to extend their right arm horizontally with the palm facing down and move their arm in a vertical motion.
  Stopping/braking
  UK and Ireland
  To signal they intend to slow down or stop, the driver, cyclist or horse rider should extend their right arm slightly below horizontally with their palm facing downwards, then move it up and down.
  US and Canada
  The left arm is horizontally extended with the forearm angled downward.
  Italy
  The right arm is vertically extended with the palm facing forward. Cyclists use a different hand signal to indicate a right turn. When a cyclist wishes to turn right, they typically extend their right arm straight out to the right side of the bicycle.
  Australia
  The right arm is vertically extended with the palm facing forward. Alternatively, the right upper arm is extended horizontally with the forearm extended downwards, palm facing forward.
  Denmark
  Either arm is extended vertically. It is also common practice to extend the upper arm horizontally with the forearm extended downwards, palm facing forward.
  South Africa
  The right upper arm is extended horizontally, with the forearm vertical and palm facing forward as depicted in the US right turn signal above.