When I was in high school there was a thing going around where a group of people would block a road, both sides, either with themselves, a car, or with debris or whatever. And whoever stopped got mugged at least, if not abducted and raped. And of course they would take the car.
We were taught to never stop on the highway or on a road. Either go through them or turn around and go the other way. But do not stop.
It didn't last for very long. I imagine a lot of the thieves were either run over or shot. There are a lot of gullible people out there who will stop and try to figure out what is going on. But there are many more who will run right over them.
That is a dangerous way to try to do a mugging. The moving car has all the advantage, especially if they are armed.