[xtian]

Well roads do vary in their physical form and the social norms that govern their use in different parts of the world based on a lot of factors.

But I would say roads in developed areas are pretty much the same everywhere because cars are only made one way. The social consensus I mentioned was moving towards requiring a governor on cars that would shut their engines off if they exceeded 25 mph. If that had succeeded and endured, roads would look very different. But the economic effects that cars produce in accelerating the free flow of commodities, labor, and capital necessitated a rupture with the established order so that automobiles could continue to develop to be bigger, faster, and more powerful.

The similarities in road form and norms around the world represent an equilibrium between the current level of car technology and the amount of injury and death resulting from their use that society can metabolize.