The north three tunnels opened in 1931 as a bypass to a section of North Broadway; the southernmost (and longest) opened in 1935, connecting to Figueroa Street downtown. In 1943, the Figueroa Street Viaduct was built to the north of the tunnels. This dedicated the tunnels to 4 lanes of eastward traffic, and the viaduct to 4 lanes of westward traffic. Several connections have been added to the street, most notably in 1940 to the Arroyo Seco Parkway and in 1953 to the Four Level Interchange.