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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You could design and build a surface that is “better” in being more elastic and less prone to cracking.
However, asphalt and concrete are mostly just rocks with some binders in them. Quite literally nothing else you try to use will be as cheap, readily available, easily brought to site, and easily fixed.
There’s more considerations in play than just making the best feeling road.
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