[1] ULTra Personal Rapid Transit System at London Heathrow Airport [Online].
Available: http://www.ultraprt.com/heathrow/
[2] West Virginia University Transportaion & Parking [Online].
Available: http://transportation.wvu.edu/prt
[3] Google Driverless Car [Online].
Available: http://en.wikipedia.org/wiki/Google_driverless_car
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