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Now Playing: 10-31-12 Marketplace Tech Report

With the city's mayor warning it could be days before subway trains are restored, a key question is what are other options for the 5.3 million people that use New York's system on a typical day? Turns out, the Los Alamos National Laboratory has transportation simulation software that can help cities get the planning down to a science. And, how a shakeup at the top of Apple might affect the electronic device in your pocket. The senior executive deemed responsible for the company's clumsy mapping software is out.  after reportedly refusing to sign a letter of apology for the maps.