. U.S. Route 101, is the 2nd mainly important north-south U.S. highway that runs throughout the states of California, Oregon, and Washington, on the West Coast of the US. It is also known as El Camino Real where its route all along the southern and central California coast approximates the old trail which connected the Spanish missions, pueblos, and presidios. It merges at a few points with California Highway 1.
.The U.S.101 highway's "northern" end is in Olympia, Washington, although the northernmost end on the highway is in Port Angeles. The southern end of U.S. 101 is in Los Angeles, California at the East Los Angeles crossing point, the world's busiest freeway interchange.