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.
California State Route 114
The route begins at U.S. Route 101 in East Palo Alto. From here, it heads east into Menlo Park. Here, it meets Hamilton Avenue and its east end at SR 84, which continues to the Dumbarton Bridge over the San Francisco Bay.
When defined in 1963, the route began at I-280 and ended at US 101. In 1984, a segment of SR 84 in the vicinity was swapped with SR 114, moving SR 114 from I-280 to SR 84, which followed Willow Road, as it does today. In 1990, however, the I-280 section was truncated and the terminus was switched to US 101.