Because the first rule of data communications is that it goes down at the worst possible moment. No matter what, you can't win. Scenario 1: You're driving rem

Because the first rule of data communications is that it goes down at the worst possible moment. No matter what, you can't win. Scenario 1: You're driving remotely and the connection goes down. The car then crashes into something. Scenario 2: You get clever: Whenever the connection goes down, the car automatically stops. The connection goes down, and the car now stops in the middle of an intersection, or the onramp to a ferry, or blocking emergency vehicles. Scenario 3: You get even more clever: Whenever the connection goes down, the car seeks a safe place to stop. The connection goes down, and the car runs over a collapsed pedestrian while looking for a safe place to stop. You can't win.