22111. All required signals given by hand and arm shall be given from the left side of a vehicle in the following manner: (a) Left turn--hand and arm extended horizontally beyond the side of the vehicle. (b) Right turn--hand and arm extended upward beyond the side of the vehicle, except that a bicyclist may extend the right hand and arm horizontally to the right side of the bicycle. (c) Stop or sudden decrease of speed signal--hand and arm extended downward beyond the side of the vehicle.