it would get shut down by the authorities right quick for disrupting traffic and lots of people would be mad about it.

Tell that to the sports stadiums in my city.

Those cyclists are irresponsible pricks for riding in a pack like that.

I was replying to your comment.

Roads don’t belong to cars. If each of the bikers were in their own car for a 3 mile long traffic blob for some hobby event no one would have batted an eye.