LOLOL! This was tried in the '70s as the smelly elite tried to shut D.C. down on May Day.
I sat that one out and watched from my window in Georgetown as our intersection at 30th and P was taken and retaken over and over again. Rebels kept putting a coin operated big scale from the drug store in the middle of the intersection. And they picked up VW's and moved them to block the road. Police would come along and move them back where they belonged.
All in all. it was a lot worse then.