Question: What San Francisco street that is famous for a section known as "the crookedest street in the world" is partially designated as part of U.S. Route 101?
Sentence (from "U.S. Route 101 in California"): Significant portions of US 101 between the Los Angeles area and the San Francisco Bay Area follow El Camino Real, the historic road connecting the former Alta California's 21 missions.
Relevant evidence: No