Yerba Buena Island Tunnel California

To cross over the San Francisco Oakland Bay Bridge, drivers must travel through Yerba Buena Island by way of the Yerba Buena Island Tunnel. The tunnel, completed in 1936, remains the largest single bore tunnel in the world, measuring 76 feet wide and 58 feet high. To accommodate the large amount of traffic that travels across the bridge, the tunnel consists of two decks, each carrying five lanes.