And what a proxy it is. The damage caused to pavement by a vehicle's axle load is proportional to the quartic of its axle load. A 2 ton car actually causes roug

And what a proxy it is. The damage caused to pavement by a vehicle's axle load is proportional to the quartic of its axle load. A 2 ton car actually causes roughly 2^4 = 16 times more damage than a 1 ton car of equivalent make does. The savage exponential here really puts into light one reason why freight trains continue to be such important logistical infrastructure.