U.S. Route 23 Business (Bay City, Michigan)
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| Location | Pontiac |
| Length | 8.384 mi (13.493 km) |
| Existed | 1963–present |
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| Location | Saginaw |
| Length | 7.338 mi (11.809 km) |
| Existed | 1961–1971 |
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| Location | Bay City |
| Length | 3.047 mi (4.904 km) |
| Existed | 1961–present |
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| Location | West Branch |
| Existed | 1973–present |
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| Location | Roscommon |
| Length | 6.935 mi (11.161 km) |
| Existed | 1973–present |
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| Location | Grayling |
| Length | 5.823 mi (9.371 km) |
| Existed | 1961–present |
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| Location | Indian River |
| Length | 3.975 mi (6.397 km) |
| History | Proposed in 2015–17 to CCRC and MDOT |
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| Location | Gaylord |
| Length | 3.391 mi (5.457 km) |
| Existed | 1986–present |
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| Location | St. Ignace |
| Length | 4.719 mi (7.594 km) |
| Existed | 1960–present |
| Tourist routes |
 Lake Huron Circle Tour
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There have been nine business routes for Interstate 75 in the US state of Michigan. Numbered either Business Loop Interstate 75 (BL I-75) or Business Spur Interstate 75 (BS I-75) depending if they are a full business loop or a business spur, these highways are former routings of I-75's predecessor highways in the state. They were designated as I-75 was completed through the various areas of Michigan. The business loop in Pontiac runs through that city's downtown along a section of Woodward Avenue and a segment of roadway formerly used by M-24. The former Saginaw business loop was once a part of US Highway 23 (US 23), as was most of the original Bay City business loop. The roadways that make up the business loops in West Branch and Roscommon were previously part of M-76, I-75's predecessor through that part of the state. In Northern Michigan, the Grayling and Gaylord BL I-75s were part of US 27, and the two business routes in St. Ignace and Sault Ste. Marie in the Upper Peninsula of Michigan were part of US 2. A tenth business route, a loop through Indian River has been proposed. Each of the business loops connects to I-75 on both ends and runs through their respective cities' downtown areas. The two business spurs only connect to I-75 on one end and run into the appropriate downtown.
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Wikipedia