Sebastian Thrun's team was the first winner of DARPA driverless vehicles (2nd year) challenge, the year before that contestants failed very early. Do you know car manufacturers with such know-how ? They probably had research about it but I doubt they were as complete. Since Google backed the project they did very extensive tests in the real world. GM and such are bringing back computer aided driving but I'm sure they're too busy sustaining their business to put resources in something as disruptive and risky.
