That's why Google insists that full autonomy is required. They don't think semi-autonomy is safe enough. Better to completely remove the steering wheel, brakes

That's why Google insists that full autonomy is required. They don't think semi-autonomy is safe enough. Better to completely remove the steering wheel, brakes and gas pedal than try for some half-way hybrid. No human can stay alert enough to take split-second evasive maneuvers while doing nothing 3599 seconds out of 3600.