This guide is for general information only and is not legal advice. Laws change — verify current rules with your state DOT or a licensed attorney before relying on this for any legal matter. Read full disclaimer.
The rule
In Missouri, the DUI statute does not apply to bicyclists — it covers motor-vehicle operators only. Missouri's DWI statute (RSMo § 577.010) applies to anyone operating a 'motor vehicle' while intoxicated. RSMo § 301.010 defines motor vehicle to exclude human-powered devices, so bicycles fall outside DWI. Public-intoxication and careless-and-imprudent-driving charges may still apply to an impaired rider. See RSMo § 577.010 (Driving while intoxicated).
A DUI charge isn't on the table for cyclists in Missouri, but that's not a license to ride drunk — public-intoxication, reckless-conduct, and disorderly-conduct charges can still apply, and cycling impaired dramatically raises crash risk.