RCW 46.61.758Hand signals.All hand signals required of persons operating bicycles shall be given in the following manner:(1) Left turn. Left hand and arm extended horizontally beyond the side of the bicycle;(2) Right turn. Left hand and arm extended upward beyond the side of the bicycle, or right hand and arm extended horizontally to the right side of the bicycle;(3) Stop or decrease speed. Left hand and arm extended downward beyond the side of the bicycle.The hand signals required by this section shall be given before initiation of a turn.[ 1982 c 55 s 8.]
Washington Legal Code