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 101 in California
From Ventura and through Santa Barbara, US 101 closely follows the Pacific coastline (generally no more than from the shore) until Gaviota State Park, about west of Goleta. At Gaviota State Park, the highway shifts back from an east–west highway to a north–south alignment. About north of this point, US 101 passes through the Gaviota Tunnel.