This bridge, known simply as the "Bay Bridge" by the people who live in the "Bay Area," is the widest in the world, and perhaps the most costly. Construction of the latest expansion was completed in 2013 at a cost of $6.5 billion. It's ten lanes carry a quarter-million vehicles per day. The Bay Bridge is also one of the longer bridges in the world, at over 4 miles (7.18 kilometes) in length.
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