Analysis of information sources in references of the Wikipedia article "สะพานข้ามอ่าวซานฟรานซิสโก–โอกแลนด์" in Thai language version.
Anticipated Completion Date: late 2013
Traffic Volumes: Annual Average Daily Traffic
45.5 million toll-paid vehicles (91.0 million trips) annually
Far inside Yerba Buena, miners have bored ribs down from a crown tunnel to two side tunnels and placed 40 I-beams in these lateral drifts. For 20 ฟุต [6.1 เมตร], steel lining has been placed on top of the I-beam ribs, and the space between these plates and the rock roof has been packed with broken rock. The work of concreteing this loose rock above the steel, all of which later will be encased in concrete, has just been started.
The Yerba Buena Island Tunnel, 65 feel wide by 52 feet high, through which a four-story building could be towed upright, is the largest diameter bore in the world.
The Yerba Buena Island Tunnel, 65 feel wide by 52 feet high, through which a four-story building could be towed upright, is the largest diameter bore in the world.
Anticipated Completion Date: late 2013
