(a) An operator shall use the signal authorized by § 545.106 to indicate an intention to turn, change lanes, or start from a parked position.
(b) An operator intending to turn a vehicle right or left shall signal continuously for not less than the last 100 feet of movement of the vehicle before the turn.

(c) An operator may not light the signals on only one side of the vehicle on a parked or disabled vehicle or use the signals as a courtesy or “do pass” signal to the operator of another vehicle approaching from the rear.