Interstate 80 begins at the approach to the Bay Bridge and is the only direct automobile link to the East Bay. U.S. Route 101 connects to the western terminus of Interstate 80 and provides access to the south of the city along San Francisco Bay toward Silicon Valley. Northward, the routing for U.S. 101 uses arterial streets Mission Street (northbound) and South Van Ness Avenue (southbound), Van Ness Avenue, Lombard Street, Richardson Avenue, and Doyle Drive to connect to the Golden Gate Bridge, the only direct automobile link to Marin County and the North Bay.