U.S. Route 20
U.S. Highway 20 (US 20) is an east–west United States highway that stretches from the Pacific Northwest all the way to New England. The "0" in its route number indicates that US 20 is a coast-to-coast route. Spanning , it is the longest road in the United States, and particularly from Newport, Oregon to Boston, Massachusetts, the route is roughly parallel to that of the newer Interstate 90 (I-90), which is in turn the longest Interstate Highway in the U.S. There is a discontinuity in the official designation of US 20 through Yellowstone National Park, with unnumbered roads used to traverse the park.
Interstate 57
In the state of Illinois, Interstate 57 runs from the bridge over the Mississippi River north to Chicago. I-57 is the longest Interstate Highway in Illinois. Its route follows essentially the earlier route of US 51 in southernmost Illinois (US 51 has been diverted to I-57 where I-57 has always been close to old US 51 between Future City and Dongola) before taking a northeastward diagonal to Illinois 37, which remains intact as a town-to-town through route, past its interchange with Interstate 24 (the northwestern terminus of Interstate 24) near Pulleys Mill and a short duplex with Interstate 64 near Mount Vernon north to Effingham, where it has a short concurrence with Interstate 70. It then follows US 45 bypassing cities of Champaign and Urbana (where it meets Interstates 72 and 74), and heads north to Onarga whereafter it follows the formerly duplex path of US 45 and (now decommissioned in most of Illinois) old US 54 to Kankakee. At Kankakee it heads northward largely parallel to the now decommissioned route of old US 54 (since renumbered largely as Illinois 50) into the Chicago area, meeting Interstate 80 in Hazel Crest, Interstate 294 in Blue Island, and feeding Interstate 94 on Chicago's South Side.