Business routes of Interstate 69 in Michigan

BL I-94 which was originally part of I-94's predecessor, US 25

business loop formed from part of the old US 27 and part of US 12 near and through Coldwater. At the southern end, it begins at exit 10 on I-69 where Fenn Road crosses the freeway. The business loop follows the two-lane Fenn Road west for about three-quarters of a mile (1.2 km), then curves north to merge with old US 27 (Angola Road). The highway runs northward through farmland south of Coldwater, and after approximately two miles (3.2 km), it enters the city limit at Garfield Road. Once in Coldwater, the business loop follows Clay Street through residential neighborhoods. After another half mile (0.8 km), the highway reaches a fork where Clay Street continues due north and Division Street branches to the northeast; BL I-69 follows the four-lane Division Street for about another mile (1.6 km) to the main intersection in the city known locally as "the Four Corners." This intersection is where old US 27 intersects US 12 (Chicago Street). BL I-69 turns eastward along the four-lane US 12 and continues from the Four Corners back to I-69 at exit 13.^[3][4]

American Association of State Highway Officials (AASHO),^[8][b] and the new US 27 replaced M-29 in the area.^[10] In September 1967, the freeway bypassing Coldwater opened.^[2] At the same time, the old route through the city was redesignated as BL I-69.^[11][12]

business loop that took over the Business US 27 (Bus. US 27) route inside Charlotte. It is a surface street for the nearly five miles (8.0 km) of the loop. The trunkline starts just outside the city of Charlotte at exit 57 and follows Cochran Road The loop travels due north through rural areas south of town along a two-lane road. North of a crossing of the Battle Creek River, Cochrane Road widens to include a center turn lane. About 2+3⁄4 miles (4.4 km) north of the starting point, BL I-69 begins a 3⁄4-mile-long (1.2 km) concurrency with M-50 at Shepherd Street. North of Warren Avenue, BL I-69/M-50 widens to four lanes, two in each direction. The concurrency ends at Lawrence Avenue; M-50 continues north, and the business loop heads east on Lawrence Avenue for a few blocks. That intersection also marks the eastern terminus of M-79. From that point, BL I-69 follows Lawrence Avenue and then veers northeast onto Lansing Street to complete its loop at exit 61.^[3][15]

AASHO^[8][b] and the new US 27 replaced M-29 through Coldwater.^[10] By the end of the next year, M-78 was extended from downtown Charlotte along US 27 to run northeasterly toward Lansing.^[16] The highway through downtown Charlotte was first designated Bus. US 27 after the 1961 completion of a non-freeway bypass, a two-lane, limited-access highway east of the city. At that point I-69 only existed in the southern parts of Michigan.^[17][18] That freeway was not extended up to the city when the southernmost segment of I-69 was completed in 1967.^[11][12] By 1971, I-69 was completed to Charlotte and at the time US 27 was cosigned with I-69, the bypass being incorporated into I-69.^[19][20] For three years the business loop in Charlotte was not signed as BL I-69, but it was so designated in 1974 and Bus. US 27 was decommissioned in and near Charlotte.^[13][14]

Sparrow Hospital; east of this intersection two blocks separate the two directions of the highway. The business loop crosses the Grand River in downtown Lansing near the campus of Lansing Community College north of the Michigan State Capitol.^[23][24]

Bath Township.^[23][24]

AASHO,^[8][b] and the new US 27 replaced M-29 and M-14 in the area.^[10] By the end of the next year, M-78 was extended from Charlotte along US 27 to through downtown Lansing. M-78 separated from US 27 in downtown Lansing and continued northeasterly through the northern part of East Lansing.^[16] M-39 was replaced with an extended M-43 in 1938.^[25][26]

BL I-94 on four-lane Military Avenue parallel to the St. Clair River. North of the crossing of the Black River, BL I-69/BL I-94 continues northward on Huron Avenue through downtown. At the intersection with Glenwood Avenue, the business loop turns northwesterly onto Pine Grove Avenue through residential areas on the north side of the city. The street is five lanes, two in each direction with a center turn lane, and passes under the I-94/I-69 freeway at the toll and customs plazas for the Blue Water Bridge; north of the freeway, there is a ramp to connect to the eastbound direction of the freeway and the bridge. The business loop continues along Pine Grove Avenue, intersecting the southern end of M-25 at Hancock Street. At that intersection, the business loop turns westward for a block. It then turns south along the connector to terminate at westbound I-94/I-69 west of the Blue Water Bridge toll plaza.^[34][35]

Bus. US 25 when the main highway was shifted out to the freeway.^[37][38] The first freeway segment of M-21 was built into the Port Huron area in 1966; the freeway directly tied into the western end of the old route into downtown.^[39][40] In 1973, US 25 was decommissioned in the state, and the former Bus. US 25 was renumbered BL I-94.^[41][42] The remaining segment of freeway along the M-21 corridor opened in 1984 as I-69; after this freeway opened, M-21 was shortened to Flint, and the former M-21 in Port Huron became Business Spur I-69.^[32][33] To connect back to I-69, the business route was extended northward along BL I-94 when that highway was designated through downtown in 1986.^[43][44]