We drive the Prince William Parkway frequently and have seen several instances of the ABS keeping a clearly drunk driver ON THE ROAD rather than letting her drive into a ditch.
There's that 'swerve' they almost always get into and ABS puts on the brakes when that happens.
These systems can have a number of other features, like Lane Keeping Assistance in addition to resistance to more violent manuevers like roll over and spin minimization.
Autonomous vehicles have been demonstrated in recent years and that is the future. I will welcome a vehicle that can be it's own valet parker.