In this Jan. 4, 2013 photo, Lyft driver Nancy Tcheou smiles as she drives in San Francisco. Fed up with traditional taxis, city dwellers are tapping their smartphones to hitch rides from strangers using mobile apps that allow riders and drivers to find each other. Internet-enabled ridesharing services such as Lyft, Uber and Sidecar are expanding rapidly in San Francisco, New York and other U.S. cities, billing themselves as a high-tech, low-cost alternative to cabs. (AP Photo/Jeff Chiu)

Associated Press
In this Jan. 4, 2013 photo, Lyft driver Nancy Tcheou smiles as she drives in San Francisco. Fed up with traditional taxis, city dwellers are tapping their smartphones to hitch rides from strangers using mobile apps that allow riders and drivers to find each other. Internet-enabled ridesharing services such as Lyft, Uber and Sidecar are expanding rapidly in San Francisco, New York and other U.S. cities, billing themselves as a high-tech, low-cost alternative to cabs. (AP Photo/Jeff Chiu)
In this Jan. 4, 2013 photo, Lyft driver Nancy Tcheou smiles as she drives in San Francisco. Fed up with traditional taxis, city dwellers are tapping their smartphones to hitch rides from strangers using mobile apps that allow riders and drivers to find each other. Internet-enabled ridesharing services such as Lyft, Uber and Sidecar are expanding rapidly in San Francisco, New York and other U.S. cities, billing themselves as a high-tech, low-cost alternative to cabs. (AP Photo/Jeff Chiu)
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