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Additional faults - that 2.5 foot high guard rail along the edge of the cliff is less likely to stop a 6 foot high, 5000 lbs SUV from going over the edge than a 4 foot high, 2500 lbs car.
Also inertia isn't your friend when you're trying to recover from a skid on a slick, icy road. Greater weight = greater inertia.
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