[Causality1]

A rough way to think about road wear is the weight over one axle to the fourth power times the number of axles.

[na85]

That gives you a quantity of force^4. How does that translate to road wear?

[cheerlessbog]

Empirical studies apparently find road wear matches a power law. Although it seems the exponent varies.

Here's a survey https://www.nzta.govt.nz/assets/resources/603/RR-603-The-rel...

[na85]

That's for rutting damage, which doesn't necessarily translate linearly to particulate formation/flaking.