Bridging the San Francisco Bay Metropolitan Area with a structure 58 ft. Wide, double deck, and eight and half miles long over navigable water is an accomplished feat. The upper deck is divided into six auto lanes and the lower will carry three truck lanes and two train tracks. The main spans are 2320 ft. long with a vertical clearance of 185 ft. Cost was $77,000,000. Auto speed limit of 45 miles is allowed.