When an autonomous car abruptly quits driving—or simply makes a mistake—there's a moment when you're worse off than if you had no driver assist technologies at all. Volvo is planning a pilot program in Gothenburg, Sweden, to study this very moment. One hundred XC90 drivers will test a system that handles all the driving, not just part of it. If, for whatever reason, the car has a sensor failure or can't understand its surroundings, it'll find a safe place to pull over. That scenario is vastly preferable to what we have now, where a car with lane-keeping and active cruise control systems will essentially throw up its virtual arms and storm out of the room while the car continues down the road at 70 mph.