Interstate 80 crosses San Francisco at an edifice that carries how many vehicles?
Interstate 80 in California:  From there it heads east across the Bay Bridge to Oakland, where it turns north and crosses the Carquinez Bridge before turning back northeast through the Sacramento Valley. San Francisco–Oakland Bay Bridge:  As part of Interstate 80 and the direct road between San Francisco and Oakland, it carries about 260,000 vehicles a day on its two decks.
260,000 vehicles