Future self-driving cars might be reliable enough to ditch the steering wheel. But what happens if you do need to take over in a pinch? With Ford, it might be as simple as pulling out your phone. The company recently obtained a US patent for two driving modes that would use a touchscreen device to steer an otherwise autonomous vehicle once you receive permission. The first mode, as Autoblog pointed out, would mimic the tilt-to-steer mechanic from games like Real Racing 3 -- your device's accelerometer and gyroscope would guide the front wheels. It'd be intuitive, if a little disconcerting when it would involve a ton of real metal hurtling down the road.