If such vehicle is disabled so that it is necessary that it remain on the roadway or shoulder of the highway, the driver or other person in charge of such vehicle shall cause operating flares to be placed upon the roadway or shoulder of the highway, one approximately 100 feet in front of such vehicle, one approximately 100 feet to the rear, and one on the traffic side of the vehicle. Such flares shall remain in place until such vehicle is removed from the roadway or shoulder. (Amended 1971, No. 228 (Adj. Sess.), § 20; 1981, No. 156 (Adj. Sess.), § 2.)