M-14 is an east–west state trunkline highway in the southeastern portion of the US state of Michigan. Entirely freeway, it runs for to connect Ann Arbor with Detroit by way of a connection with Interstate 96 (I-96). The western terminus is at a partial interchange with I-94 west of Ann Arbor. From there, the freeway curves around the north side of Ann Arbor and runs concurrently with US Highway 23 (US 23). East of that section, M-14 passes through woodlands and fields in Washtenaw County. In Wayne County, the freeway returns to a suburban area of mixed residential neighborhoods and light industrial areas. It crosses two different rivers and a pair of rail lines as it approaches Detroit's inner suburbs, where it terminates at an interchange between I-96 and I-275. When the state's highway system was first signed in 1919, there was a different M-14 that ran the length of the Lower Peninsula of Michigan. This was later replaced by a pair of different US Highways in the 1920s and 1930s. Another M-14 was designated that lasted until the 1940s. The current highway dates back to 1956 when it was designated along a series of roads that previously carried US 12. During the 1960s and 1970s, M-14 was moved to the freeway alignment it currently uses; sections of the former route are still maintained by the Michigan Department of Transportation (MDOT) as unsigned highways. Route description The western terminus of M-14 is west of Ann Arbor, at exit 171 on I-94. This is a partial interchange; only traffic from eastbound I-94 can access eastbound M-14, and traffic from westbound M-14 must follow westbound I-94. From this junction, M-14 runs northeasterly through suburban Scio Township. The freeway is bordered by residential subdivisions to the southeast and woodlands to the northwest. M-14 curves around to the east through an interchange that has ramps that connect Miller and Maple roads; the ramps connect to Maple Road through a pair of roundabouts. As it approaches the Huron River, the freeway has an interchange with Business US 23 (Bus. US 23); the two highways merge and run concurrently to the north over the river. Bus. US 23/M-14 then has an unusual right-in/right-out interchange that uses short connector roads to provide access to Barton Drive on the north side of the river. The freeway then continues north to an interchange with US 23. The business loop