That might work!

> What a total idiot in the police car.

It's important to make sure we have all the context before making a judgement like this. My rule of thumb is that if I think something is obviously stupid, I'm probably missing something.

Can safely assume that American cops are stupid, especially if they do this.

> With a car on lane keeping / cruise control you could slow down in front of it all the way to a stop and it will gladly stop behind you.

Blue Cruise, and I assume Tesla's FSD as well, will simply change the lane and go around you.

If the guy had a simple LKAS and adaptive cruise control on, then yes, you're right.

Older systems including the older versions of Blue Cruise may not go around you, but you also don’t know if they even have radar cruise control enabled.

If it’s a simple enough system maybe it would just keep going the same speed no matter what until it hit you.

GM supercruise will go around you too I have it

There was a news story here in town a few years back where a private citizen - not cop - brought a ghost car (driver passed out) to a stop by driving up in front of it, making bumper contact and then braking both to a stop. Not recommended! But can be done even without adaptive cruise control.