(1) Whenever any motor truck or bus is stopped upon the highway except for the purpose of picking up or discharging passengers, or its lighting equipment is disabled during the period when lighted lamps must be displayed on vehicles and such motor truck or bus cannot immediately be removed from the main traveled portion of a highway outside of a business or residence district, the driver or other person in charge of such vehicle shall cause such flares, fusees, reflectors, or other signals to be lighted or otherwise placed in an operating condition and placed upon the highway, one at a distance of approximately one hundred feet to the rear of the vehicle, one approximately one hundred feet in advance of the vehicle and the third upon the roadway side of the vehicle. However, if the vehicle is transporting inflammables, no flares (pot torches) fusees, oil lanterns, or any signal produced by a flame, may be used, and in lieu of such signals, either (a) three red electric lanterns or flares and three red cloth flags, or (b) three emergency reflectors and three red cloth flags shall be used.

(2) Whenever any motor truck or bus is stopped upon the highway except for the purpose of picking up or discharging passengers between the hours of one half hour before sunrise and one half hour after sunset, the driver or person in charge of such vehicle shall place upon the highway in a standing position red flags, one at a distance not less than one hundred feet to the rear of the vehicle and one not less than one hundred feet in advance of the vehicle and the third upon the roadway side of the vehicle.

(3) No person shall at any time operate a motor truck transporting explosives as a cargo or part of a cargo upon the highway unless it carries (a) electric lanterns or flares and red cloth flags or (b) red emergency reflectors and red cloth flags as required in Section 63-7-69. Such electric flares, electric lanterns and emergency reflectors must be capable of producing a red light or red reflection and shall be displayed upon the roadway when and as required in this section.