(a) Any motor vehicle may be equipped with not more than two side cowl or fender lamps which shall emit an amber or white light without glare.

(b) Any motor vehicle may be equipped with not more than one running board courtesy lamp on each side thereof which shall emit a white or amber light without glare.

(c) All motor vehicles shall be equipped with a minimum of at least two functioning back-up lamps either separately or in combination with other lamps, unless the vehicle was originally equipped with one lamp.   Any such back-up lamp shall not be lighted when the motor vehicle is in forward motion. School buses used for the transportation of school children in this state, whether owned and operated by a county board of education or privately owned and operated under contract with a county Board of Education, shall be equipped with at least two back-up lamps, one on each side of the rear door, with white lens or reflectors, capable of lighting the roadway and objects to the rear of the bus for safe backing during darkness, and which, at the option of the county board of education, may each provide fifty candlepower in illumination intensity instead of thirty-two candlepower.

(d) Any vehicle may be equipped with lamps which may be used for the purpose of warning the operators of other vehicles of the presence of a vehicular traffic hazard requiring the exercise of unusual care in approaching, overtaking or passing, and when so equipped may display such warning in addition to any other warning signals required by this article. The lamps used to display such warning to the front shall be mounted at the same level and as widely spaced laterally as practicable and shall display simultaneously flashing white or amber lights, or any shade of color between white and amber. The lamps used to display such warning to the rear shall be mounted at the same level and as widely spaced laterally as practicable, and shall show simultaneously flashing amber or red lights, or any shade of color between amber and red.

(e) Vehicles used by "rural mail carriers" in carrying or delivering mail in rural areas may be equipped with amber flashing lights. Such lights shall be on the front and rear of the vehicle and may be activated when the vehicle is stopped or decreasing speed in order to stop in the course of carrying, delivering or picking up mail along the route.

(f) Vehicles used as the lead car in a funeral procession are hereby authorized to be equipped with, but are not required to use, purple lamps or purple flashing lights. Such lamps may be used for the purpose of warning the operators of other vehicles of the presence of a vehicular traffic hazard requiring the exercise of unusual care in approaching, overtaking or passing a funeral procession, and when so equipped may display such warning in addition to any other warning signals required by this article. The lamps or flashing lights used to display such warning to the front shall be mounted at the same level and as widely spaced laterally as practicable and shall display simultaneously either illuminated or flashing purple lights. The lamps used to display such warning to the rear shall be mounted at the same level and as widely spaced laterally as practicable, and shall show simultaneously flashing or illuminated purple light.