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I wonder why concrete isn't used more frequently, because it lasts a lot longer, requiring less traffic disruption due to maintenance, is more efficient, and reflects more sunlight (for the global warming concerned).
That said, I do notice the concrete in CA is insanely bumpy. I once drove in an old Dodge Ram van, and the suspension was nearly maxing the bottom and top range as I hopped down the freeway. It's unclear if it was made that way, or developed due to age. Wonder if there's an engineering solution to prevent such massive bumps from developing?
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