Not long ago, the idea that you could design a car that could drive itself and its passengers from place to place safely was something out of science fiction films. But the idea has gone from drawing boards to a prototype to the road.
At least two companies have set early versions of the self-driving car out for a spin – Audi, the German maker of some high-end cars and SUVs, and Google.
But what should we really expect from this "personalized mass transit" concept? How much will it change or even kill the traditional American car culture? Auto contributor Mark Savage explains.