>This does not address a larger question: how much does a mile of road cost to keep? Half of that design chart is for reconstruction and repaving. What else ar

>This does not address a larger question: how much does a mile of road cost to keep? Half of that design chart is for reconstruction and repaving. What else are you looking for? >an enormous civilizational overhead You could eliminate suburbia overnight, and demand for those suburban and rural highways will still be there, since cities generally need things delivered from outside (like food) in order to continue being cities.