Except for emergency systems. If you have two or more independent systems that are able to stop, should any of them should detect an anomaly, you are far more l

Except for emergency systems. If you have two or more independent systems that are able to stop, should any of them should detect an anomaly, you are far more likely to survive a partial system failure. The end result of all systems identifying the problem is the same. In a modern car there are plenty of systems that independently will start. An example is some cars that are fixed to prepare your breaks if you take your foot off the accelerator quickly, more or less giving you instant breaking. At the same time, completely independent of this, emergency breaking might already have been started by the collision detection system.