I like the idea of your ‘block the city’ so I would like to offer an change. At noon put your car in PARK for 5 minutes no matter where you are. Then at 12:30 do it again and again at 1:00, 1:30, 2:00.
This will keep you from being towed or actually preventing an ambulance from getting to the hospital with an injured person.
If you could arrange to do this with a friend and do it side by side it would be more effective yet. There’s lot’s of tricks for people who are too chicken to just sit there. Put the car in PARK, open the hood, get out and go jiggle a wire on the engine. Get back in the car and start it up, get out, close the hood and drive away. Or somewhere during the ‘stall’, get a rag out of the trunk and play with the engine a bit more.
By 3:30 you will have your method down pat and be a professional at jammimg up an intersection. If there was just 100 or 200 people in the whole city doing this you can bet it would be noticed by the city leaders. Then do it again the next day and the next.......
For my idea, everyone do it in their own city.