Swindon is adorned as the world's highly confusing intersecting road. But astonishment attains height finding out that this is one of the splendidly functional intersection and it was thoroughly designed to reduce the traffic congestion. It was a success. This is absolutely an urban wonder.
Now we have Dunedin in New Zealand where one would find the steepest street in the world. Here in Dunedin the streets were constructed taking into account the grid patterns and least attention being paid towards the terrain. The outcome was an astounding 40 degree inclined road.