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
The western terminus of NH 101 is in Keene at the junction with New Hampshire Routes 9, 10 and 12. The eastern terminus is in Hampton Beach at the junction with Ocean Boulevard (NH 1A). The total length of NH 101 is . However, the New Hampshire Department of Transportation has installed mileposts on the freeway section east of Interstate 93 that begin at mile 100.