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 signals shall indicate as follows:
I. Left turn-Hand and arm extended horizontally.
II. Right turn-Hand and arm extended upward. Or optionally, when on a bicycle, by extending the right hand and arm horizontally.
III. Stop or decrease speed-Hand and arm extended downward.
Source. 1948, 232:1, par. 18-c. RSA 263:26. 1963, 330:1. RSA 262-A:44. 1981, 146:1, eff. Jan. 1, 1982. 2018, 46:2, eff. July 14, 2018.