> Road damage per-axel is proportional to the weight carried by the axel raised to the fourth power! That's not true. But the truth is even worse than that. Th

> Road damage per-axel is proportional to the weight carried by the axel raised to the fourth power! That's not true. But the truth is even worse than that. The effect is highly non-linear. Depending on type, composition, age and temperature, the road material require minimum load to become plastic. Below that critical load the surface can withstand wear and tear of practically infinite amount of trips (have you ever seen a road where the surface was rubbed away by passing cars?) Of course, some aging processes continue regardless of whether cars are or are not using roads.