FILE - In this January, 16, 2011, file photo, a driverless vehicle which is controlled by an advanced navigation system arrives at the Personal Rapid Transport (PRT) station at the Masd

 

              FILE - In this January, 16, 2011, file photo, a driverless vehicle which is controlled by an advanced navigation system arrives at the Personal Rapid Transport (PRT) station at the Masd
FILE - In this January, 16, 2011, file photo, a driverless vehicle which is controlled by an advanced navigation system arrives at the Personal Rapid Transport (PRT) station at the Masdar Institute campus in Abu Dhabi in the United Arab Emirates. The United Arab Emirates introduced the world's longest automated rail system, 32 miles, in Dubai in 2009. (AP Photo/Kamran Jebreili, File)