(a) No person shall turn a vehicle from a direct course or move right or left upon a roadway unless and until such movement can be made with reasonable safety and then only after giving a clearly audible signal by sounding the horn if any pedestrian may be affected by such movement or after giving an appropriate visual signal in the manner hereinafter provided.
(b) A signal of intention to turn right or left shall be given continuously during not less than the last 100 feet traveled by the vehicle before turning.
(c) A turn signal shall be given to indicate an intention to change lanes or start from a parallel parked position.
(Added Coun. J. 7-12-90, p. 18634)