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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. 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. ==Pontiac== Business Loop I-75 (BL I-75) is a business loop serving Pontiac and Auburn Hills. It uses portions of former Business M-24 (Bus. M-24) through town. The highway starts as an eight-lane freeway at an interchange on I-75 in Bloomfield Township. The freeway continues past an interchange with Opdyke Road to end at Square Lake Road, dropping to six lanes. BL I-75 continues to M-1 at Woodward Avenue. Square Lake Road continues to the west as Bus. US 24, BL I-75 turns northwesterly along the eight-lane divided Woodward Avenue, running concurrently with Bus. US 24 into downtown Pontiac. At the south side of downtown, Woodward drops to six lanes the two directions of Woodward Avenue split and form a four-lane loop. The Woodward Avenue Loop encircles downtown Pontiac, and it is crossed by the eastbound direction of M-59 running on Huron Street. One block north, the westbound direction of M-59 runs along University Drive and turns to follow BL I-75/Bus. US 24 (Woodward Avenue Loop). The loop intersects Perry Street another block further north, and BL I-75 turns northeasterly onto the two-way Perry Street. BL I-75 passes through residential areas and a minor business area along the four-lane Perry Street. Outside of the downtown area, Perry Street widens to include a center turn lane. North of Walton Boulevard in Auburn Hills, the street name changes to Lapeer Road. BL I-75 intersects Opdyke Road a couple hundred feet west of I-75 before crossing the freeway. Lapeer Road continues as a six-lane, divided roadway to the ramps of a double trumpet interchange, where the BL I-75 designation ends. The roadway however, continues as M-24 providing access to the Palace of Auburn Hills. On average each day in 2013, 9,829 vehicles use the business loop between the two M-59 junctions, and 73,795 vehicles do so on the freeway stub east of Opdyke Road, the lowest and highest traffic counts. In 1919 when the state highway system was first numbered, the main north–south highway through Pontiac was numbered M-10, and it was renumbered to US 10 seven years later when the United States Numbered Highway System was created. By the next year, M-24 was designated from downtown Pontiac northward to Lapeer. M-24 was moved to an eastern bypass of town in 1936, and the former routing in town became M-24A. This was redesignated Bus M-24 in 1940. A number of highway designation and routing changes in the Pontiac were made when US 10 was shifted out of downtown to replace M-58 along Telegraph Road west of downtown by the middle of 1961. Before the change, US 10 followed Dixie Highway and Oakland Avenue southeast into Pontiac to Perry Street and then Perry to Woodward while M-58 was routed along Telegraph and Square Lake roads. After the change, US 10 turned south from Dixie Highway onto Telegraph and then east onto Square Lake to connect back to Woodward. The old route through downtown was assigned the Bus. US 10 moniker and M-58 was decommissioned as a highway designation. Two years later, I-75 was completed to the east of Pontiac, and the M-24 bypass of the city was turned over to local control. The former Bus. M-24 through downtown was renumbered BL I-75 along with a connection along Square Lake Road out to the freeway.〔〔 The next year, the streets downtown Pontiac were reconfigured and a loop called Wide Track Drive was created to route traffic around the downtown area. The former routing of BL I-75 on Perry Street in the downtown core was replaced by routing the business loops on Wide Track Drive.〔 Then in 1966, an interchange was built to replace the intersection at Opdyke Road and Square Lake Road. In 1985, the Michigan Department of Transportation (MDOT) received permission from the American Association of State Highway and Transportation Officials to truncate US 10 to Bay City, and when the change was made the following year, US 24 replaced US 10 on Telegraph Road north of Square Lake Road, and Bus. US 10 through downtown was redesignated Bus. US 24, including the segment concurrent with BL I-75. Wide Track Drive through downtown was renamed as the Woodward Avenue Loop in 2000. The section of BL I-75 that follows Woodward Avenue has a pair of special designations attached to it. In 1999, it was designated by MDOT as what is now called a Pure Michigan Byway. Three years later, it was named a National Scenic Byway by the Federal Highway Administration National Scenic Byways Program on June 13, 2002, the only urban road at the time with that classification. It was later upgraded to All-American Road status on October 16, 2009. Major intersections 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Business routes of Interstate 75 in Michigan」の詳細全文を読む スポンサード リンク
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