The challenge is that our tailgating rules aren’t sufficient for extreme cases. Two seconds behind someone is sufficient for most cases, but if the person in fr

The challenge is that our tailgating rules aren’t sufficient for extreme cases. Two seconds behind someone is sufficient for most cases, but if the person in front of you, say, hits a wall and comes to an immediate stop, it won’t be enough. So if autonomous systems hit the brakes much more severely than conditions warrant, it’s not obvious that the drivers behind you are going to have time to react.