>>2027241It does. Ever since they started allowing urbanists on this board, you can't have a thread about road infrastructure without them trying to derail it.
Building up is always more expensive than building out. Not only up front for the design and construction but ongoing maintenance as well. The higher you go, the more expensive it becomes.
Even so there are a number of elevated highways around the world. The only triple-decked roads I know of offhand (that aren't part of a stack interchange) would be parts of Wacker Drive in Chicago and a portion of the BQE in NYC that has lanes cantilevered on top of the lanes below it built into the side of a hill. I think that one's getting replaced soon because of its age.
