Years ago I did a lot of driving around rural Latin America and it could not have been more different from a US city. Official traffic rules were almost non-existent in many areas but the informal ones that had evolved worked shockingly well. Like a cramped two way street might only have room for one car in spots, but there would be a pattern for pulling over and letting opposing traffic pass.

Things like that would probably break down at a certain level of crowded-ness, but it did somewhat change my view of regulation in general. I think there are a lot of cases where people will figure things out just fine if you leave them alone and count on them to be responsible, versus having a million detailed rules that are poorly enforced.