Mich. Comp. Laws § 257.719c: Truck and semitrailers used for transporting passengers for sightseeing purposes.

Sec. 719c.

Notwithstanding section 719, a truck may be used to haul not more than 4 semitrailers for the purpose of transporting passengers for sightseeing purposes with the approval of the local unit of government in which the truck is to be operated not to exceed 3 miles beyond the boundaries of the local unit and if the truck does not exceed a speed of 25 miles per hour.

A truck and semitrailers described in this section shall meet the following requirements:

Be equipped with hazard warning lights, and slow-moving vehicle emblems as described in section 688.

Be equipped with safety belts as described in section 710e for each individual seat within 1 year after the effective date of this section.

Any applicable federal safety standards.

A driver of a truck regulated by this section shall secure the proper group vehicle designation and any endorsement required on his or her operator's or chauffeur's license before operating a truck regulated by this section.

A truck and semitrailers used as described in this section shall be inspected annually by the department of state police.