An autonomous car that is not environment-aware cannot be on the road with anything else. It may be able to tell where it is via GPS, but if it can't tell where hazards are, then it's only good for driving alone on unobstructed roads. That's my problem with Audi's effort for Pike's Peak. It might win a timed robot car race when it's the only thing on the road, but put one person accidentally on that road and it will merrily plough them down and continue on its way none the wiser. With another car on the road, it has no hope.
Mokalus of Borg
PS - I consider it interesting research but ultimately a dead-end.
PPS - Though I guess it could be slowed down and incorporated into other cars.