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4. Brooklyn Bridge
Brooklyn's—and the city's, and maybe the world's—most iconic bridge took 123,640 vehicles a day between Brooklyn and Manhattan in 2010, just 60 percent of the load handled by the Verrazano Bridge. That's probably because it's just one of three bridges that cross the East River from Brooklyn to Manhattan, and there's also the Battery Tunnel, which took another more than 50,000 vehicles a day. Plus, it's the only bridge on this list so far that also accommodates pedestrians and bicyclists, 4,000 of the former and more than 3,000 of the latter every day.