Business routes of U.S. Route 127 in Michigan
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| Highway system | |
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| Location: | Jackson |
| Length: | 6.443 mi (10.369 km) |
| Existed: | c. 1959–present |
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| Location: | Mason |
| Length: | 2.369 mi (3.813 km) |
| Existed: | c. 1946–1964 |
| Business US Highway 127 | |
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| Location: | Lansing |
| Length: | 4.725 mi (7.604 km) |
| Existed: | 2002–present |
| History: | Never signed as Bus. US 127 |
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| Location: | St. Johns |
| Length: | 8.808 mi (14.175 km) |
| Existed: | 2002–present |
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| Location: | Ithaca |
| Length: | 3.745 mi (6.027 km) |
| Existed: | 2002–present |
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| Location: | Alma |
| Length: | 5.631 mi (9.062 km) |
| Existed: | 2002–present |
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| Location: | St. Louis |
| Length: | 4.711 mi (7.582 km) |
| Existed: | 2002–present |
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| Location: | Mount Pleasant |
| Length: | 5.688 mi (9.154 km) |
| Existed: | 2002–present |
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| Location: | Clare |
| Length: | 3.374 mi (5.430 km) |
| Existed: | 2002–present |
There have been 10 business routes of US Highway 127 in the state of Michigan. The business routes are all sections of state trunkline highway that run through the central business districts of their respective towns connecting them to the mainline highway outside of those downtown areas. These various business routes were formerly part of the routing of US Highway 127 (US 127) or its predecessor in Central Michigan, US 27, before the construction of highway bypasses. The southern two, in Jackson and Mason were previously parts of US 127, while seven of the northern eight (Lansing, St. Johns, Ithaca, St. Louis, Mount Pleasant, Clare and Harrison) were originally part of US 27, a highway which was replaced on its northern end by US 127 in 2002. The business loop through Alma was once numbered US 27A.
In the late 1920s, US 27 was shifted to run through St. Louis instead of Alma, and the former route was renumbered US 27A. US 127 was realigned near Mason in the mid-1940s, and a business loop was created out of the former routing there. A similar bypass of Jackson in the late 1950s also spawned a business loop. In the early 1960s, a new expressway (later freeway) for US 27 through Central Michigan led to the creation of several business loops. Other bypasses opened in the 1980s and 1990s and created the last two business loops. The 2002 extension of US 127 to replace US 27 also led to the redesignation of business loops to their current monikers.
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