In that case it has a safe failure mode. In the Tesla case it doesn't--it's relying on those lines for guidance. The car suddenly has no idea where the road i

In that case it has a safe failure mode. In the Tesla case it doesn't--it's relying on those lines for guidance. The car suddenly has no idea where the road is. The choices are basically turn off, or turn off and engage the brakes. With a human able to take control the former is the better choice.