The 12 lane Verrazano-Narrows_Bridge{The lower deck opened on June 28, 1969.}
http://en.wikipedia.org/wiki/Verrazano-Narrows_Bridge#History
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The 14 lane George_Washington_Bridge
{As originally built, the bridge offered six lanes of traffic, but in 1946, two additional lanes were provided on what is now the upper level. A second, lower deck, which had been anticipated in Ammann's original plans, was added, opening to the public on August 29, 1962. The additional deck increased the capacity of the bridge by 75 percent, making the George Washington Bridge the world's only 14-lane suspension bridge, providing eight lanes on the upper level and six on the lower deck.}
http://en.wikipedia.org/wiki/George_Washington_Bridge#History
