Among the highways through the South Side are I-94 (which goes by the names Dan Ryan Expressway, Bishop Ford Freeway, and Kingery Expressway on the South Side), I-90 (which goes by the names Dan Ryan Expressway, and Chicago Skyway on the South Side), I-57, I-55, U.S.
Even though the highway is of little importance to the transportation needs of Arizona, as it does not link any Arizona communities, it does serve as a vital link between Salt Lake City and Las Vegas and Los Angeles to the southwest.
MDOT has erected milemarkers along the two Michigan segments of the highway that use the total mileage starting at the state line in Ironwood; the signs on the eastern segment reflect the mileage in Florence County, Wisconsin.
More than 12,000 miles (19,000 km) of roads make up the state's major highway skeleton, including state-operated highways, ten turnpikes or major toll roads, and the longest drivable stretch of Route 66 in the nation.
On April 1, 1985, ownership and maintenance of NY 373 east of Lake Street was transferred from the town of Chesterfield to the state of New York as part of a highway maintenance swap between the state and Essex County.