It's all about how MUCH EMP something is hit with. In the last EMP Commission tests (which were years ago), only a small percentage of cars were severely affected. Most started right back up. My worry is the newer cars where the steering is all electronic, meaning a sudden power loss = out of control vehicle. Can you imagine the amount of accidents that will cause in an EMP attack? That is going to be horrific. Cars careening off bridges, overpasses, etc. when going 70 mph and now no steering. Scary.