[RobinL]

It's actually a fourth power law, not a linear relationship. So trucks are polynomially more damaging. https://en.wikipedia.org/wiki/Fourth_power_law

[tonyedgecombe]

I wonder if that applies to the amount of material the tyres shed as well.

[hinkley]

Well they have more tires than four vehicles do.

[villmann]

> Well they have more tires than four vehicles do. Actually, four vehicles would have more tyres in total (: