MI HB5913

Requires the operator and each passenger of a motor vehicle to wear a properly adjusted and fastened safety belt while operating on Michigan streets or highways, with exceptions for vehicles manufactured before January 1, 1965, buses, motorcycles, mopeds, and vehicles not required to have safety belts under federal law.

Exempts individuals with written physician verification of physical or medical inability to wear a safety belt, commercial/postal vehicles making frequent stops, rural postal carriers, and school bus passengers.

Establishes specific child restraint requirements: children under 4 years must use appropriate car seats, children 4-8 years and under 4'9" must use child restraint systems, and children 4-16 years must wear safety belts.

Allows operators to seat children 8-16 years in rear seats if all available front seat safety belts are occupied by adults or older children, with exception for pickup trucks without extended cabs where front seat placement is permitted without a belt if all front belts are in use.

Specifies that safety belt violations are civil infractions with penalties limited to no more than 5% reduction in damage recovery, no points assessed under driving records, and requires law enforcement investigation of harassment complaints related to enforcement of this section.