Mich. Comp. Laws § 257.628b: Maximum speed in certain political subdivisions; vehicle, bicycle or other device; snowmobile exception; violation as civil infraction.

Sec. 628b.

(1) Subsection (2) applies only in a political subdivision that prohibits by ordinance, regulation, or resolution the operation of nonemergency motor vehicles in the political subdivision.

(2) Notwithstanding sections 627 and 628, an individual who operates a vehicle, a bicycle, or any other device on a state trunkline highway within a political subdivision described in subsection (1) shall not exceed either of the following speed limits:

(a) Except as otherwise provided in this subdivision and subdivision (b), 15 miles per hour. This subdivision does not apply to a snowmobile.

(b) Within a business district of a political subdivision described in subsection (1), 10 miles per hour.

(3) An individual who violates this section is responsible for a civil infraction.

(4) As used in this section:

(a) "Historic snowmobile" means that term as defined in section 82101 of the natural resources and environmental protection act, 1994 PA 451, MCL 324.82101.

(b) "Snowmobile" means a vehicle that meets all of the following requirements:

( i ) Is engine-driven.

( ii ) Has an endless belt tread.

( iii ) Was originally manufactured solely for operation over snow.

( iv ) Is steered by 2 sled-type runners or skis that are in contact with the snow and the distance between the centers of the spindles of which is, except for a historic snowmobile, not more than 48 inches.