All signals herein required given by hand and arm shall be given from the left side of the vehicle in the following manner and such signal shall indicate as follows: A. left turn: hand and arm extended horizontally; B. right turn: hand and arm extended upward; and C. stop or decrease speed: hand and arm extended downward. History: 1953 Comp., § 64-7-327, enacted by Laws 1978, ch. 35, § 431.