Creating an Android app named "UltraReset" and using it in tandem with an NFC-enabled Android phone (a Nexus S, in this case), security researchers Corey Benninger and Max Sobell were able to reset and reuse -- free of charge -- transit access cards in both San Francisco's MUNI system and New Jersey's PATH system.

ENGADGET: Security researchers identify transit system exploit in San Fran and New Jersey, create app to prove it

"Certainly, using the automated systems does reduce the number of staff we need, " says Katsuya Hagane, the manager in charge of operations at New Transit Yurikamome.

NPR: Practically Human: Can Smart Machines Do Your Job?

The Golden Gate Bridge, Highway and Transportation District is in charge of the bridge, which 38 million vehicles crossed last year, as well as transit buses and ferry services that it estimates serve more than 9 million customers annually, according to its website.

CNN: STORY HIGHLIGHTS