is there any business route which is a part of it?
Yes, Business U.S. Highway 8.
U.S. Route 8
Business U.S. Highway 8 (Bus. US 8) in Rhinelander, Wisconsin, was a locally maintained business loop highway routing through the central business district of the city. The route was designated when US 8 was shifted to a bypass of downtown in 1992. 
which places are connected by u.s. route 8? Interstate 35 in Forest Lake, Minnesota, to US 2 at Norway.
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U.S. Route 8 [SEP] Business route
Before the signage was removed, Bus. US 8 started at the western junction of US 8 and WIS 47. The business loop ran east from this intersection along Kemp Street, crossing the Wisconsin River north of the convergence with the Pelican River. The loop jogged north along Oneida Street for 3 blocks and turned east again on Lincoln Street. East of town, Bus. US 8 intersected WIS 17 and turned to the southeast. Outside of town, the business loop ran through wooded terrain and turned south near Clear Lake. Near the larger George Lake, the roadway curved back east along the lake's southern shore, running parallel to the main highway before turning south to connect to the main highway.