https://twitter.com/rabbitfordinner/status/1740609135044083919
this mf thinks we still have medieval walled cities, like dude, you can literally just... walk out of the city. I mean, yeah, you can indeed disrupt logistics, but there's a pretty big gap between "trucks can't get in to deliver supplies" and "entire population is trapped inside of the city". Also railway transport isn't real I guess
also love the idea of completely destroying supply routes into the city with... backhoes and gravel. I guess city folk don't have any construction equipment of their own to clear and repair their roads. Also I guess the roads are just going to be conveniently completely empty for however many hours it takes you to block them, because, uh...
do an area study 
Lmao, took them all of 4 people to do it.
But yeah, pretty much. Disrupt traffic flow at a major intersection a bit by your usual non-enforced traffic infractions like double parking inconveniently or missing much or all of the green phase due to being on your smartphone or similar, 3 other people do the same at feeding arterial roads for like 10 minutes until all the impatient carbrains start trying to cheat their way onto non-cleared intersections and ta-da, gridlock that's now become a massive headache to unfuck. x10 if you can convince someone to get into a minor fender bender after it and then start arguing and taking lots and lots of photos on the road. Takes like 4 guys with all of the conviction of "maybe get a ticket" to pull it off, I'm genuinely surprised no one ever tried it.
There's some push button crosswalks around a major bottleneck bridge where I am. I'm certain 3 people just crossing the streets over and over would bring traffic to a halt