Mo. Rev. Stat. § 307.095: Colors of various lamps — restriction of red lights, penalty.

1. Headlamps, when lighted, shall exhibit lights substantially white in color; auxiliary lamps, cowllamps and spotlamps, when lighted, shall exhibit lights substantially white, yellow or amber in color. No person shall drive or move any vehicle or equipment, except a school bus when used for school purposes or an emergency vehicle upon any street or highway with any lamp or device thereon displaying a red light visible from directly in front thereof.

2. Notwithstanding the provisions of section 307.120, violation of this section is an infraction.