 US 34 formerly overlapped US 66 all the way to its endpoint in downtown Chicago, but was truncated to its intersection with US 66 and IL 43 in Berwyn in 1970.When US 66 was subsequently eliminated, the endpoint of US 34 was left at that location—the intersection of Ogden and Harlem Avenues in Berwyn.Due to the elimination of US 66, it is one of the few US Numbered Highways that ends at a state highway.