I think for the proscribed use case the situation where you require human intervention is where the traffic jam clears up and it’s time to drive at highway spee

I think for the proscribed use case the situation where you require human intervention is where the traffic jam clears up and it’s time to drive at highway speed again. Not an emergency. I’m having a hard time imagining a situation where you would need to speedily regain complete control to avert a crisis that a human wouldn’t already fail.