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.
New Hampshire Route 101
NH 101 is a two-lane surface road from its western terminus in Keene to the western terminus of New Hampshire Route 101A in Milford. From there, NH 101 splits off to the south and becomes a two-lane limited-access highway that bypasses Milford and Amherst, becoming a two-lane surface road just north of Amherst. At the eastern terminus of New Hampshire Route 114 in Bedford, NH 101 becomes a four-lane limited-access highway. It expands to six lanes upon merging with Interstate 293 in Manchester, and eight lanes upon merging with Interstate 93. East of I-93, NH 101 narrows to four lanes. The route remains a four-lane expressway until exit 12 (Interstate 95) in Hampton, where NH 101 becomes a two-lane freeway at exit 13. At an interchange with U.S. Route 1, it becomes a two-lane surface road to its terminus in Hampton Beach.