Opening and closing vehicle doors.
Mo. Rev. Stat. § 300.340
in effect300.340. Opening and closing vehicle doors. — No person shall open the door of a motor vehicle on the side available to moving traffic unless and until it is reasonably safe to do so, nor shall any person leave a door open on the side of a motor vehicle available to moving traffic for a period of time longer than necessary to load or unload passengers.
(L. 1965 p. 445 § 69)
Source: Open US Law by Vaquill AI (CC BY 4.0)URL: https://revisor.mo.gov/main/OneSection.aspx?section=300.340Fetched: 10/17/2026