Fourth power law
Rule in road engineering
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A shame they didn't mention how much more impact heavier vehicles have in numerical terms. A 2 tonne 2 axle car has 16 times more impact than a 1 tonne one. Electric vehicles are significantly heavier than their ICE equivalents too.
en.wikipedia.org/wiki/Fourth_...
en.wikipedia.org/wiki/Fourth_...
The most fun part is that road wear scales with vehicle weight to the fourth power, so doubling the weight increases wear sixteen-fold. I think vehicle tax should work that way too. A Land Rover Defender 130 should pay 64× the tax of a Smart car. en.wikipedia.org/wiki/Fourth_...
The relationship between vehicle weight and road damage has been known for a long time: it's ~proportional to the fourth power of axle weight.
Some estimates of damage Vs axle weight.
en.wikipedia.org/wiki/Fourth_...
en.wikipedia.org/wiki/Fourth_...
en.wikipedia.org/wiki/Fourth_...
Article: www.theguardian.com/uk-news/2026...
Fourth power law: en.wikipedia.org/wiki/Fourth_...
Fourth power law: en.wikipedia.org/wiki/Fourth_...
There's a paper from 1962 which has been repeatedly questioned.
It's at best a rule of thumb for heavy vehicles - none of the testing was performed with lighter ones and a whole bunch of factors were not tested.
en.wikipedia.org/wiki/Fourth_...
It's at best a rule of thumb for heavy vehicles - none of the testing was performed with lighter ones and a whole bunch of factors were not tested.
en.wikipedia.org/wiki/Fourth_...
Road damage is proportional to the fourth power of axle weight.
en.wikipedia.org/wiki/Fourth_...
en.wikipedia.org/wiki/Fourth_...
Wear is proportional to axle-load to the fourth power, not quadratic.
en.wikipedia.org/wiki/Fourth_...
en.wikipedia.org/wiki/Fourth_...
Si les taxes étaient liées aux dégâts faits par les véhicules, et en se basant sur ces 333 €/an, chaque conducteur de pick-up devrait payer environ 17.000 € chaque année.
Et, les cyclistes, zéro.
(0,000053 €/an, pour être plus précis)
en.wikipedia.org/wiki/Fourth_...
Et, les cyclistes, zéro.
(0,000053 €/an, pour être plus précis)
en.wikipedia.org/wiki/Fourth_...
