All signals required under this chapter which may be given by hand and arm shall when so given be given from the left side of the vehicle and the following manner and interpretation thereof is suggested:
1. Left turn — Hand and arm extended horizontally.
2. Right turn — Hand and arm extended upward.
3. Stop or decrease of speed — Hand and arm extended downward.
For applicable scheduled fine, see §805.8A, subsection 6
RIGHT-OF-WAY