MO HB1831

Creates "Calvin's Law" prohibiting children under 10 years old from riding as passengers on motorcycles or motortricycles unless the vehicle has a proper passenger seat and the child can place both feet on the passenger foot pegs

Requires all passengers under 10 years old to wear protective headgear meeting state standards

Allows law enforcement to stop vehicles solely to check compliance with child passenger requirements, unlike general helmet law enforcement which prohibits stops solely for helmet checks

Increases fine for helmet violations involving children under 10 from $25 to up to $100

Effective date of January 1, 2027; medical exemptions available when certified by a licensed physician