U.S. Route 101
The nearly highway's northern terminus is in Tumwater, Washington: the route remains along the Olympic Peninsula's coastal perimeter west, north, and east; the northernmost point on the highway is in Port Angeles. The southern terminus of US 101 is in Los Angeles at the East Los Angeles Interchange, the world's busiest freeway interchange.
U.S. Route 141
In 1986, the states in the Great Lakes region created the LMCT as part of a larger program of tourist routes in the region; US 141 carries the LMCT between the northern I-43 junction in the Green Bay area north to the split with US 41 at Abrams. In the first years of the 21st century, US 141 was expanded to a four-lane expressway northward from Abrams to Oconto Falls. A further upgrade in 2006 expanded the highway to four-lanes northward to Beaver. On April 7, 2015, the segment of US 141 that runs concurrently with US 41 on the west side of Green Bay designated a part of I-41 by the Federal Highway Administration.