Why do we still use concrete and asphalt for our roadways? Why have we not found a better material that is less prone to potholes and always feels smooth to drive on?
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IIRC roads in America could be made to last longer using existing materials but typically aren’t. It’s cheaper to make the bases and top layers thinner and thus last less time. Spending more money would result in roads that last longer and cost less money over time. But making a road that lasts past your term and in to the term of your successor isn’t politically expedient; nor can you funnel as much money into your brother-in-laws construction business.
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