Section 935.134 - Arm signals(a) Any person operating a motor vehicle and making a turn or coming to a stop shall signal the turn or stop in accordance with this section.(b) A signal for a turn or stop is made by fully extending the left arm as follows:(1) Left turn-extend left arm horizontally.(2) Right turn-extend left arm upward.(3) Stop or decrease speed-extend left arm downward.(c) A signal light or other device may be used in place of an arm signal prescribed in paragraph (b) of this section if it is visible and intelligible.