M-54 (Michigan highway)

M-54 is a state trunkline highway in the US state of Michigan that bypasses the city of Flint. It is named Dort Highway in much of its length, in honor of Flint carriage and automobile pioneer Josiah Dallas Dort. The portion from the north end of Dort Highway to Clio Road is part of the historic Saginaw Trail, and was also part of the old Dixie Highway. The modern highway runs for 30.276 miles (48.724 km) through Genesee and Saginaw counties from a connection with Interstate 75 (I-75) near Grand Blanc on the south to Birch Run on the north. The highway serves mostly suburban and urban sections of the Flint area. Outside of the city, it also passes through agricultural areas in northern Genesee County and southeastern Saginaw County.

The first state highway along the general route of M-54 was M-10, one of the original state trunklines signed in 1919. Later, it was redesignated as part of US Highway 10 (US 10) in the 1920s. After a series of realignments in the 1940s and 1960s, the roadway was given the M-54 designation in 1962. A segment of Saginaw Road through Flint was redesignated a business route in the 1940s that became Business M-54 (Bus. M-54) as well in 1962. That business loop was decommissioned in 1974. Previously, two other highways in Michigan bore the M-54 designation: a roadway that is now part of M-37 and one that is Bus. US 2 in Ironwood.