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A comment on What are those dents in I-90 outside Seattle?. Parent comment

Re:What are those dents in I-90 outside Seattle? by nemo44x on Friday December 30, 2022 @05:39PM (#34190968)
Many roads are composite here. They have a sub-road made of reenforced concrete that creates a stable layer and then asphalt is laid on top. Because the asphalt wears out it is easily ripped off the concrete layer and repaved.
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