Milwaukee has two auxiliary Interstate Highways, I-894 and I-794. I-894 extends from the western suburbs to the southern suburbs, bypassing downtown. I-794 extends east from the Marquette Interchange to Lake Michigan before turning south over the Hoan Bridge toward General Mitchell International Airport, turning into Highway 794 along the way. Milwaukee is also served by three US Highways. U.S. Highway 18 (US 18) provides a link from downtown to points west. US 41 and US 45 both provide north–south freeway transportation on the western side of the city. The freeway system in Milwaukee carries roughly 25% of all travel in Wisconsin.
Milwaukee Avenue (Chicago) Tollway split off, continuing to Milwaukee. From Harlem Avenue northwards it is Illinois Route 21. Milwaukee Avenue is a popular route for bicyclists. The southeastern end of Milwaukee Avenue is the most heavily bicycled stretch of road in Chicago, with cyclists accounting for 22% of all traffic there on a randomly selected day in September. The street is lined with storefronts, restaurants and the occasional art gallery through most of the city. The CTA's Blue Line runs beneath or alongside Milwaukee Avenue from its beginning at Canal and Lake Streets out to Logan Boulevard, with stations at Grand Avenue, Chicago