The St. Joseph Valley Parkway is a freeway in the U.S. states of Indiana and Michigan, serving as a bypass route around Elkhart, Mishawaka, and South Bend in Indiana and Niles in Michigan. The freeway runs to the south and west of Elkhart and South Bend and Niles and consists of segments of U.S. Route 31 (US 31) and US 20; those two highway designations run concurrently at the southwestern rim of the South Bend metropolitan area. It continues north to run along the St. Joseph River valley.
M-28 is an east–west state trunkline highway that traverses nearly all of the Upper Peninsula of the U.S. state of Michigan, from Wakefield to near Sault Ste. Marie in Bruce Township. Along with US Highway 2 (US 2), M-28 forms a pair of primary highways linking the Upper Peninsula from end to end, providing a major access route for traffic from Michigan and Canada along the southern shore of Lake Superior. M-28 is the longest state trunkline in Michigan numbered with the "M-" prefix at 290.373 miles (467.310 km). The entire highway is listed on the National Highway System, while three sections of M-28 are part of the Lake Superior Circle Tour. M-28 also carries two memorial highway designations along its route.
M-62 is an arc-shaped state trunkline highway in the southwestern part of the US state of Michigan. The highway runs from the Indiana state line north and west to M-140 in Eau Claire. In between, it serves the western Cass County communities of Dowagiac and Cassopolis. The highway was formed in the 1920s, originally as a north–south route. It was later extended, taking the current arc-shaped routing. A short truncation in the 1950s produced the current routing, which has remained unchanged since. In total, M-62 runs about 28+1⁄3 miles (45.6 km) in the two counties.
M-205 was a state trunkline highway in the US state of Michigan. The route was turned back to local control in October 2002 by the Michigan Department of Transportation (MDOT) after the completion of M-217. MDOT swapped roadways with the Cass County Road Commission ending the 67-year history of M-205.
M-40 is a north–south state trunkline highway in the Lower Peninsula of the US state of Michigan. The highway runs from US Highway 12 (US 12) near the Indiana state line in Porter Township north through Paw Paw and Allegan to end in the outskirts of Holland. The current northern end is near Interstate 196 (I-196) at an intersection with US 31/Business Loop I-196 (BL 196). In between, M-40 runs through mixed agricultural and forest lands and along lakes and rivers through Southwest Michigan.
M-51 is a north–south state trunkline highway in the southwestern portion of the US state of Michigan. The southern terminus is at a connection with State Road 933 across the Michigan–Indiana state line near South Bend, Indiana. From there the trunkline runs north through an interchange with US Highway 12 (US 12) into Niles along a route that was once part of Business US 12. North of Niles, the highway runs parallel to a river and a rail line through rural areas. The northern terminus is on Interstate 94 (I-94) west of Paw Paw.
M-53 is a north–south state trunkline highway in the US state of Michigan that connects Detroit to The Thumb region. The highway starts in Detroit at a connection with M-3 and ends in Port Austin, Michigan at M-25. In between, the trunkline passes through the northern suburbs of Metro Detroit, connects to freeways like Interstate 69 (I-69) and provides access to rural farmland. In Macomb County, M-53 follows the Christopher Columbus Freeway and POW/MIA Memorial Freeway, while the remainder of the highway is known as Van Dyke Avenue in the metro area or Van Dyke Road elsewhere. The highway has also been named the Earle Memorial Highway for one of the pioneers of the Good Roads Movement and Michigan's highway system.
M-120 is a state trunkline highway in the US state of Michigan in the southwest Lower Peninsula. The highway runs northeast from Muskegon to Hesperia. In between, the road passes through suburban Muskegon, forests and farmland. Some 5,900–26,000 vehicles use the highway each day on average as it runs long a series of roads that follow county lines in the area.
M-294 is a state trunkline highway in Calhoun County in the US state of Michigan. It is one of a handful of highways that was established or realigned as a result of a rationalization process initiated in 1998 during the tenure of Governor John Engler. M-294 is approximately two miles (3.2 km) east of Interstate 194 (I-194) and connects M-96 with I-94 southeast of Battle Creek.
M-81 is an east–west state trunkline highway in the Lower Peninsula of the US state of Michigan. The trunkline travels from the city of Saginaw at the junction with M-13 to the junction with M-53 east of Cass City over the county line in Greenleaf Township in northwestern Sanilac County in The Thumb area of the state. Outside of the cities and villages along its route, M-81 passes through mostly rural farm country. Near Saginaw it intersects the freeway that carries both Interstate 75 (I-75) and US Highway 23 (US 23) in an industrial area.
M-137 was a state trunkline highway in the US state of Michigan that served as a spur route to the Interlochen Center for the Arts and Interlochen State Park. It started south of the park and ran north between two lakes in the area and through the community of Interlochen to US Highway 31 (US 31) in Grand Traverse County. The highway was first shown without a number label on maps in 1930 and labeled after an extension the next year. The highway's current routing was established in the 1950s. Jurisdiction of the roadway was transferred from the Michigan Department of Transportation (MDOT) to the Grand Traverse County Road Commission in June 2020, and the highway designation was decommissioned in the process; signage was removed by August 2020 to reflect the changeover.
M-138 is a 20-mile-long (32 km) east–west state trunkline highway in The Thumb region of the US state of Michigan. The highway runs from a junction with M-15 west of the unincorporated community of Munger in Bay County to the intersection with M-24 east of Akron in Tuscola County. The trunkline runs through rural agricultural areas outside of the villages and communities it serves. It was designated in the 1930s and extended in the 1940s. M-138 was truncated in the 1990s as well.
M-139 is a state trunkline highway entirely within Berrien County in the US state of Michigan. The highway starts at US Highway 12 (US 12) southwest of Niles and runs through rural areas of the county to terminate at an intersection with Business Loop Interstate 94 in Benton Harbor. The highway runs parallel to the St. Joseph River, crossing the river several times as it follows a set of roads previously used for US 31 in the area. The highway was first designated in the 1930s as a bypass of the Benton Harbor and St. Joseph area. Its termini have been moved over the years since, extending and contracting the length of the highway between Niles and Benton Harbor. M-139 now serves to provide access through the area from a set of bypasses consisting of I-94 and US 31.
M-152 is a state trunkline highway in the US state of Michigan in Cass and Van Buren counties. The highway runs through the Sister Lakes area providing access to the lake cabins and adjoining farmlands. The highway has existed mostly unchanged since the designation was commissioned in the 1930s.
US Highway 12 (US 12) is an east–west US Highway that runs from Aberdeen, Washington, to Detroit, Michigan. In Michigan it runs for 210 miles (338 km) between New Buffalo and Detroit as a state trunkline highway and Pure Michigan Byway. On its western end, the highway is mostly a two-lane road that runs through the southern tier of counties roughly parallel to the Indiana state line. It forms part of the Niles Bypass, a four-lane expressway south of Niles in the southwestern part of the state, and it runs concurrently with the Interstate 94 (I-94) freeway around the south side of Ypsilanti in the southeastern. In between Coldwater and the Ann Arbor area, the highway angles northeasterly and passes the Michigan International Speedway. East of Ypsilanti, US 12 follows a divided highway routing on Michigan Avenue into Detroit, where it terminates at an intersection with Cass Avenue.
US Highway 31 (US 31) is a part of the United States Numbered Highway System that runs from Alabama to the Lower Peninsula of the US state of Michigan. In Michigan, it is a state trunkline highway that runs from the Indiana–Michigan state line at Bertrand Township north to its terminus at Interstate 75 (I-75) south of Mackinaw City. Along its 356.5-mile-long (573.7 km) route, US 31 follows the Michigan section of the St. Joseph Valley Parkway as well as other freeways and divided highways northward to Ludington. North of there, the trunkline is a rural undivided highway through the Northern Michigan tourist destinations of Traverse City and Petoskey before terminating south of Mackinaw City. Along its route, US 31 has been dedicated in memory of a few different organizations, and sections of it carry the Lake Michigan Circle Tour (LMCT) moniker. Four bridges used by the highway have been recognized for their historic character as well.
US Highway 33 (US 33) is a part of the United States Numbered Highway System that was once located in Berrien County, Michigan. At the time it was removed from the state, it was only about 2.8 miles (4.5 km) long running north from the Indiana state line to an intersection with US 12 south of Niles. The highway was not originally part of the US Highway System in the state; it was added in 1938 as a second designation for part of US 31 between the state line and St. Joseph. It was later extended further north to the community of Lake Michigan Beach. This extension became the only section of US 33 that was routed independent of another highway until it was truncated to Niles. In 1997, US 33 was officially removed from the state.
Elkhart County Road 17 (CR 17) is a 23.08-mile-long (37.14 km) north–south county highway in Elkhart County, Indiana. It is currently undergoing improvements to become a four-lane divided road with non-limited traffic. CR 17 begins at the state line, connecting with state highway M-217 in Michigan. The roadway enters Indiana and becomes CR 17. Currently the improved section of CR 17 ends between CR 40 and CR 38.
CR 17 at Indiana state line
US 12 near Union 
