Could you spoof the car to exit and continue thinking you were still on a freeway? A car being spoofed into thinking it was still on a freeway, while driving on city streets, might not prioritize certain rules when it approaches an intersection.
The first component is the autodrive which uses only visual sensors to stay in the lane, stay away from the car in front of you, and maintain speed.
The second component seems to be the routing which enabled the first component to use turn signals, and route with maps. This is the piece that uses gps.
Since their attack only affects the cars GPS it does not affect the car's driving style.
