Self-driving cars designed by Google will soon be a reality on the roads of Nevada. State legislators have passed a bill that requires the Nevada Department of Motor Vehicles to draw up rules for driver-less vehicles. Assembly Bill No 511 paves the way for Googles automated Toyota Priuses and Audi TT to be operated legally in the Silver State. The hybrid vehicles use laser range finders and video cameras to detect traffic, and detailed maps to find their way from point to point. TN