Mich. Comp. Laws § 257.718: Width of load carried on passenger type vehicle; violation as civil infraction.

Sec. 718.

A passenger type vehicle shall not be operated on a highway with a load carried on the vehicle extending beyond the line of the fenders on the left side of the vehicle nor extending more than 6 inches beyond the line of the fenders on the right side of the vehicle.

A person who violates this section is responsible for a civil infraction.