M15

M15 or M-15 may refer to:

In politics

In science

In firearms and military equipment

In transportation

M-15 (Michigan highway)

M-15 is a north–south state trunkline highway in the US state of Michigan. The southern terminus is a junction with US Highway 24 (US 24) just south of Clarkston on the northwestern edge of the Detroit metropolitan area. The trunkline is a recreational route running north and northwest to the Tri-Cities area. The northern terminus is the junction with M-25 on the east side of Bay City. The total length is about 73 ²⁄₃ miles (118.6 km) between the two regions.

The original M-15 designation was used in the northern half of the state in 1919. This designation was wholly replaced by the US 41 on November 11, 1926. This previous designation contained the section of highway in Marquette County that is home to the first painted highway centerline in the nation. Another section in western Marquette County included the first bridge built by the state of Michigan. Within the next year after M-15 was replaced by US 41, the designation was reused for a new highway routing along the current highway. This current highway was extended northerly to eventually end at I-75 in Bay City, before it was scaled back slightly to end in southeast Bay City. A proposed, but unbuilt, extension around the west side of Metro Detroit later became part of the I-275 corridor.