Michigan Highways: Since 1997.

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Southern Terminus:   Downtown Detroit at cnr Woodward Ave & Adams St, three blocks south of I-75/Fisher Frwy
Northern Terminus:   Jct BL I-75 & BUS US-24 at cnr of Woodward Ave & Square Lake Rd between Pontiac and Bloomfield Hills
Length: 21.48 miles
Map: Route Map of M-1
Notes: M-1 is known as Woodward Ave for its entire length. Also once a portion of US-10, Woodward Ave is also referred to as "Detroit's [or Southeast Michigan's] Main Street.
  M-1/Woodward Ave was designated a Michigan Heritage Route by the Michigan Department of Transportation-Design Division in July 1999 and as a National Scenic Byway by FHWA National Scenic Byways Program on June 13, 2002.
  The current M-1 is the only such designation in the history of state trunklines in Michigan. Prior to 1970, there was no M-1 routing in the state. M-1 was one of the first of the "single-digit" state routes in Michigan since the late-1930s and a precursor to several other single-digit state route designations around Detroit added in the 1970s (e.g. M-3, the former M-4, M-5 and M-8).
  New! In "State Trunkline Needs, 1960–1980," a set of maps prepared by the State Highway Dept's Office of Planning, Programming Division in 1960 many possible additions, upgrades and improvements to the state trunkline system over the ensuing twenty years were depicted. Interestingly, those maps seemed to indicate the general plan was to move the US-10 designation from the Woodward Ave corridor between Detroit and Pontiac over to the I-75/Fisher Frwy once it was completed. A BUS US-10 designation was proposed for what is now M-1 in 1960, but when it came time to relocate the US-10 designation, it went west onto the John C Lodge Frwy and US-24/Telegraph Rd while Woodward itself was designated M-1.
History: 1970 - US-10 routing was transferred from Woodward Ave to the John C Lodge Frwy and Telegraph Rd, and the M-1 designation was created and added to the route.
  Late 1970s - At some point in the late-1970s, M-1 was either 'chopped' into a discontinuous route in downtown Detroit, or scaled back to Adams St altogether. When the so-called "Woodward Mall" was created along the portion of Woodward Ave from US-12/Michigan Ave & Cadillac Square northerly to Adams St, only public transportation was allowed on the street, thus relieving this part of the route of its state highway designation. Official MDOT maps show the portion of Woodward Ave from US-10/Jefferson Ave to US-12/Michigan Ave as "M-1" through 1981, and as part of US-12 from 1982-1991, again as M-1 from 1992-1996, and once again as US-12 from 1997-present. Additionally, from 1980-87, Rand McNally maps showed M-1 as following E Elizabeth St easterly from Woodward to Beaubien St, then south on Beaubien to M-3/Gratiot Ave for southbound traffic, and as beginning at M-3/Gratiot Ave and heading northerly on Brush St to E Columbia St, west on Columbia back to Woodward Ave for northbound traffic. Since no official source has been found, to date, to verify this, it can only be assumed M-1 was truncated to Adams St in the 1970s.
  1996 - The name of the downtown Birmingham "bypass" was changed from Hunter Blvd to Woodward Ave. The older alignment of Woodward through downtown Birmingham was renamed Old Woodward Ave.
  1999 (July) - The entire length of M-1/Woodward Ave is designated as a "Historic Heritage Route" by MDOT. See the Heritage Routes section of this website for more information.
  2001 (Mar 15) - During a spate of jurisdictional transfers in the City of Detroit, which included several former state trunklines in the Campus Martius area of downtown being transferred back to City of Detroit control, M-1 was actually extended south by three city blocks, or 0.23 mile. The three blocks transferred to the state, from Adams to Grand River, were part of the segment transferred to the city in the late-1970s as part of the "Woodward Mall" project. The southern terminus of M-1 is now Grand River Ave, which is the northern boundary of Detroit's Campus Martius project. Map of Campus Martius transfers.
  2004 (Apr 1) - In an odd reversal (on April Fool's Day, no less!), just three years after the route of M-1 was extended southerly along Woodward Ave from Adams St to Grand River Ave, those same three blocks were transferred back to the City of Detroit again! No clear reasoning as been uncovered as to why the three blocks of Woodward Ave from Adams to Grand River were transferred to state control in 2001 and then back to the City again in 2004.
Controlled-Access: No portion of M-1 is freeway or expressway.
NHS: Updated The entire length of M-1 is part of the NHS. (The segment of M-1 from its southern terminus to I-75 in downtown Detroit was added in 2012 with the passage of the MAP-21 funding and authorization bill.)
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