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
The US 101E designation was removed by the 1940s and became SR 17 (later I-880 and I-580) between San Jose and Santa Cruz. As the Bayshore Freeway was built along the east side of the San Francisco peninsula in the early 1950s, old US 101 along the El Camino Real was posted as US 101 Alternate or US 101A, and the freeway was marked US 101 Bypass or US 101B. In 1964, when California renumbered numerous state highways, El Camino was renumbered SR 82 and the Bayshore Freeway lost the bypass designation.