is a state highway route
in the U.S. state
. It was originally part of M-20
until that designation was changed the present route between New Era
and US 31
The current route starts at BUS US 31
where Muskegon Lake
and the Muskegon River
meet. As it crosses the river, it is known as the Veterans Memorial Causeway, with Veterans Memorial Park between the northbound and southbound sections of the road. This road continues north as Whitehall Road, which connects Muskegon to Whitehall
(the former US 31
before the freeway was built). At Whitehall Road, M-120 turns east on Holton Road and continues in a northeastern direction. At Maple Island Road, the road heads north to Hesperia.
In the 1930's, M-120 was designated on a road from US 16
for about a mile at the northwest corner of Lansing
before being redesignated on a road that runs parallel to the Michigan-Ohio
state line, and connected with Ohio SR 120
on its east end and Indiana SR 120
on its west. In 1961, the M-120 designation was retired again until its current designation. The Ohio and Indiana 120 highways are still in place today with only the county road (Old 120) in Michigan connecting them.
M-41 was the designation of a former state trunkline route in the Lower Peninsula of the U.S. state of Michigan that began near Holton and ran northwestward, ending at Hart. The highway followed the present day route of M-120 between Holton and Hesperia and an old alignment of M-82 between Hesperia and Hart.