What do you mean failsafe? That the batteries would shut down? My understanding is that in two of the incidents the drivers were able to continue driving until

What do you mean failsafe? That the batteries would shut down? My understanding is that in two of the incidents the drivers were able to continue driving until they found a safe place to get off. I think there would be a safety issue if the car completely shut off power on a freeway due to the cooling system failing.