Designed by
Title
Historic U.s. Highway 51 #190603789
Description
US 51 follows I-39, intersecting I-80 and I-88 along the way. The highway also follows US 20 south of Rockford while still following I-39. I-39/US 51 joins I-90, making US 51 of the only toll roads in Illinois that is a U.S. Highway. US 51 exits I-39/I-90 just a mile south of the Wisconsin state line.