Michigan State Highway M-39

Michigan State Highway M-39 is a state trunkline in southern Michigan serving suburban and urban corridors in Wayne County, linking communities in the Downriver area with central Detroit. The route functions as a limited-access arterial connecting residential suburbs near Taylor and Romulus with industrial and commercial districts adjacent to I-94, I-75, and Woodward Avenue. It provides access to regional destinations such as Detroit Metropolitan Wayne County Airport, Belle Isle Park, and multiple recreation areas while intersecting with major state and federal highways.

Route description

The highway begins near the Detroit Metropolitan Wayne County Airport area, traveling northward through Taylor and Dearborn Heights before entering Detroit. Along its corridor the route crosses or connects with I-94, I-275, I-75, US 12, US 24 (Telegraph Road), and M-5. Surrounding land uses include industrial zones near Ford Motor Company, commercial strips adjacent to Southfield, and residential neighborhoods associated with Grosse Pointe Woods, Dearborn, and Allen Park. The roadway features a mix of limited-access segments, grade-separated interchanges near Southfield Freeway alignments, and at-grade intersections close to Ecorse River crossings. Key transit nodes along the corridor link to services operated by Detroit Department of Transportation, Suburban Mobility Authority for Regional Transportation, and regional rail near Amtrak corridors and Conrail rights-of-way.

History

Initial planning for the route emerged during the expansion of Michigan's highway network in the early 20th century, influenced by projects such as the Interstate Highway System and statewide trunkline development under the State Highway Department. The corridor saw major improvements contemporaneous with postwar suburbanization tied to Henry Ford Hospital relocations and employment growth at Willow Run and Rouge River Plant facilities. Construction phases were coordinated with freeway projects like Jeffries Freeway and the Southfield Freeway, and were completed in stages through the mid-20th century, reflecting patterns similar to those of M-14 and M-10. Realignments addressed traffic conflicts at intersections with US 24 and with I-94, while interchange modernization paralleled work on I-96 and local arterial upgrades funded through federal programs tied to the Federal-Aid Highway Act of 1956. Maintenance and jurisdictional adjustments involved collaboration among Wayne County Road Commission, the Michigan Department of Transportation, and municipal authorities in Detroit and surrounding suburbs.

Major intersections

The route intersects multiple significant corridors, providing connections to interstate, US, and state highways. Principal interchanges and junctions include crossings with I-94, I-275, I-75, US 12, US 24, M-5, and access points to Trenton-area routes. Adjacent municipal access serves Taylor, Dearborn, Allen Park, and Southfield. The highway also interfaces with collector roads providing links to destinations such as Detroit Metropolitan Wayne County Airport, Belle Isle Park, University of Detroit Mercy, and industrial sites near the Rouge River.

Traffic and usage

Traffic volumes fluctuate seasonally and diurnally, with commuter peaks reflecting employment centers at Downtown Detroit, Dearborn, and Southfield. Freight movements utilize the corridor to reach facilities tied to Ford Motor Company, regional distribution centers for companies like General Motors, and intermodal yards connected to Conrail and CSX Transportation. Transit-oriented demand is served by Detroit Department of Transportation and Suburban Mobility Authority for Regional Transportation (SMART), while bicycle and pedestrian accommodations tie into Iron Belle Trail-related planning. Crash mitigation and congestion management strategies on the highway have been informed by studies referencing patterns seen on similar corridors such as M-10 and Woodward Avenue (M-1).

Future and planned projects

Planned projects for the corridor coordinate with regional initiatives including Southeast Michigan Council of Governments transportation plans, asset preservation programs by the Michigan Department of Transportation, and bridge rehabilitation projects similar to those undertaken on I-75 and the Ambassador Bridge. Proposed upgrades focus on interchange reconfiguration near I-94 and improved multimodal integration to serve Detroit Metropolitan Wayne County Airport expansions, transit priority lanes modeled after Gold Line proposals, and resilience measures tied to Great Lakes flood risk planning. Funding sources under consideration include federal surface transportation programs, state transportation revenue packages, and local corridor improvement authorities used in projects like the Detroit Economic Growth Corporation initiatives.

Related routes and designations

The highway forms part of a network that includes auxiliary and parallel routes such as M-5, M-14, and M-1, and interfaces with interstates including I-94, I-75, and I-275. It connects to municipal thoroughfares in Detroit, Dearborn, and Taylor and supports regional freight connections to facilities associated with Ford Motor Company, General Motors, and the Detroit/Wayne County Port Authority. Historic trunklines such as US 12 and alignments like Telegraph Road provide contextual links for traffic patterns and route numbering practices set by the American Association of State Highway and Transportation Officials. Category:State highways in Michigan