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Ladies and gentlemen, start your pickups and drive across that open construction site. Sinking in mud up to the axles? Harsh! Time to build a road. But how? The Physics of Mud When you push on wet soil with sufficient stress — and it doesn't have to be much — the soil squirts out of the way. This is what happens with your trucks on a muddy job site (not that you ever actually do it): The wheels press on the wet soil, the mud pushes out of the way, and down you go. The stress level needed to displace mud is about 500 pounds per square foot. The footprint of a truck tire is about 8