It dosnt Add up., page-15

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    Load on your driveway? Your car, twice a day.
    Load on any given section of car park? A few dozen to a few hundred cars a day, travelling at low speed.

    Load on a highway? Tens of thousands of cars, hundreds of trucks weighing tens of tonnes each, all travelling at 100+ km/h. Your estimate of 3 times the material is way off.
 
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