Why Some Roadways Are Made of Styrofoam

From “Practical Engineering”. ( YouTube / Nebula )

What do you do when soil is too heavy for the job? Use lightweight backfill!
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Over the years, engineers have come up with a lot of creative ways to mitigate the settlement of heavy stuff on soft soils, but one of those solutions seems so simple that it’s almost unbelievable: just make embankments less heavy.

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