(a) Before changing direction or materially slackening speed, a driver shall give warning of his or her intention with the hand signals as provided in section 1065 of this title, or with a mechanical or lighting device approved by the Commissioner of Motor Vehicles. A bicyclist shall give such hand signals unless he or she cannot do so safely.

(b) A person shall not turn a vehicle at an intersection unless the vehicle is in proper position upon the roadway as required in section 1061 of this title, or turn a vehicle to enter an alley, private road, or driveway, or otherwise turn a vehicle from a direct course or move right or left upon a roadway unless such movement can be made with reasonable safety.

(c) A person shall not stop or suddenly decrease the speed of a vehicle without first giving an appropriate signal in the manner provided in this section to the driver of any vehicle immediately to the rear when there is opportunity to give such signal.

(d) A signal of intention to turn right or left when required shall be given continuously during not less than the last 100 feet traveled by the vehicle before turning. A bicyclist shall comply with this subsection unless he or she cannot do so safely.

(e) The signals provided for in section 1065 of this title shall be used to indicate an intention to turn, change lanes, or start from a parked position and may not be flashed on one side only on a parked or disabled vehicle, or flashed as a courtesy or "do pass" signal to operators of other vehicles approaching from the rear. (Added 1971, No. 258 (Adj. Sess.), § 3, eff. March 1, 1973; amended 2015, No. 158 (Adj. Sess.), § 43; 2017, No. 132 (Adj. Sess.), § 11.)