Mo. Rev. Stat. ยง 307.085
307.085 Cowl, fender, running board and backup lamps โ violation, penalty.
307.085. Cowl, fender, running board and backup lamps โ violation, penalty. โ 1. Any motor vehicle may be equipped with not more than two side cowl or fender lamps which shall emit a white or yellow light without glare. 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 yellow light without glare. Any motor vehicle may be equipped with a backup lamp either separately or in combination with another lamp; except that no such backup lamp shall be continuously lighted when the motor vehicle is in forward motion.
2. Notwithstanding the provisions of section 307.120 , violation of this section is an infraction.
(L. 1941 p. 438 ยง 8386h, A.L. 1996 H.B. 1047)