The Broadway Tunnel is a roadway tunnel

Tunnel

A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end.A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers...

 in San Francisco, California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

. The tunnel opened in 1952, and serves as a high-capacity conduit for traffic between Chinatown and North Beach in the east and Russian Hill and Van Ness in the west. In a proposal of the city's 1948 Transportation Plan, the tunnel was to serve as a link between the Embarcadero Freeway and the Central Freeway

Central Freeway

The Central Freeway is a roughly one-mile elevated freeway in San Francisco, California, United States, connecting the Bayshore/James Lick Freeway with the Hayes Valley neighborhood. Most of the freeway is part of US 101, which exits at Mission Street on the way to the Golden Gate Bridge...

.

The east portal is located just past the Mason Street overpass. The west portal is located just before the Hyde Street overpass. Combined with these two overpasses, the tunnel provides for uninterrupted traffic flow along Broadway Street

Broadway Street (San Francisco)

Broadway is an east-west street in San Francisco that runs from The Embarcadero to the Cow Hollow district. The neon-lined stretch of Broadway through North Beach is the city's red-light district, home to strip clubs and other adult businesses, as well as many nightclubs and bars, and has been...

for a stretch of six blocks, between Powell Street on the east and Larkin Street on the west.