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    For trucks larger than 85 ton, you’d have to have four times the axle height. For example, there are large trucks with a six-foot axle height. This means we’d have to have a 24-foot-high berm, which means it would have to be about 48 feet wide at the base because of the angle of repose for earth berms. Our standards do not require that. MSHA states that a berm height of one times the axle height is needed. So when a tire hits the berm it starts a penetration. As the material underneath the tire compacts sufficiently, the tire starts climbing the berm.

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