attracting jobs in the logistics and transportation industries. Public transportation in the city is provided by the Rockford Mass Transit District (RMTD). Interstate 90 Known as the Northwest Tollway before 2007, the Jane Addams Memorial Tollway links the city to Madison, Wisconsin and the northwest Chicago suburbs. From Rockford north, I-90 replaces U.S. Route 51 in Illinois. I-90 also links the city with Milwaukee, Wisconsin, as I-43 joins it 2 miles north of the state line. Originally placed several miles east of the city, the Northwest Tollway would play a role in the rapid growth of the eastern half of Rockford in the later 20th century. U.S. Route 20 U.S. Route 20 travels through Rockford two different ways. The original route is now marked as a four-lane east/west business route (State Street) that divides the city to the north and south; the eastern 3 miles of State Street were expanded to six lanes in the late 1980s and 1990s to accommodate heavier commercial traffic. From the late 1970s to the end of the 20th century, this area played a key role in commercial development in Rockford. In 1965, a four-lane US 20 bypass was completed. Not a true beltway (as it does not encircle the city), the bypass starts from Interstate 90 near Cherry Valley, concurrent with Interstate 39/US 51; forming the northern terminus of I-39, the bypass links it with I-90 (carrying it into Wisconsin). Continuing westward, the bypass travels over Illinois 251 (the original routing of US 51) and Illinois 2 before traveling northwest, allowing it merge together with the business route (West State Street) approximately two miles west of the city limits. West of Rockford, US 20 (also known as the Grant Memorial Highway) provides a link to Freeport, Galena, and Dubuque, Iowa; much of the highway west of Freeport is a winding two-lane road that discourages truck traffic. To the east, US 20 roughly parallels I-90, eventually becoming a major central thoroughfare in several Chicago suburbs. The start of the US 20 bypass in Cherry Valley marks the end of where the two highways parallel each other in the United States. Interstate 39 and U.S. Route 51 U.S. Route 51 travels through Rockford twice; the original alignment of the highway is now renamed Illinois Route 251. Entering through southeast Rockford through New Milford, Route 251 travels through the eastern half of the city among several major