Ok. You can just assume that you currently live in an AnCap world where most contracts are implicit and in them there's a clause that says that most disputes that can't be solved by something called a law-book is solved by majority vote. You are free to move anywhere, but be aware that most AnCaps in this world share this view.
Have a look at any major city. An accident in the wrong place locks the place up for hours, even if you can route around the accident. And in in most cities they have these things called "houses". They kind of block they way for new roads.
1) That would be great, if it remotely resembled anything an AnCap would do...which none of it does. Try again.
2) Right, because houses take up the whole yard, especially the front part by the street. Yes, you can damage traffic flow by blocking certain roads, but you can't stop it completely, and even assuming you want to waste money by doing so, eventually you'll run out, and more sensible people will come into possession of your roads.
1) So you can't have contracts like that? Contracts that says that you can change the rules by majority vote. Or implicit contracts. Or "the spirit of the law" as somebody called it.
2) Who needs to stop it completely? I just need do disrupt it. And who's to say I can't make money out of that. I could have patches of land outside of the city that I'd want to increase the value of. Or have environmentalists pay me to plant trees there. And to build new roads, even if you find place, you still have to convince every single homeowner that they want a new road on their doorstep. A single "no" would stop any improvement efforts on your part.