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This is an illustration to neatly show how not that big an increase in weight gives a disproportionate amount of damage. Obviously, as you say, HGVs will be magnitudes worse than this
aggi-
I was looking for this, as I was pretty sure that as you went above 2tn there was an exponential rate of damage.
Happy to be proved wrong on this though.
While the vast majority of HGVs aren't proving some sort of life changing humaniarian service, they are usually doing something that has a wider societal benefit and requires a larger weight.
hugo7
Not that I disagree with the point you're making in any way, but even heavier cars cause no more damage to road surfaces than lighter ones. The vast majority of road wear is caused by HGVs.