there are 200000x the number of private cars. are you sure?
Fact: In California, the number of trucks is about 300K vs cars at 14M (about 40x).
Fact: California AADT on roads for trucks ranges from a couple of percent up to almost 50%. Very few roads have less than 10% AADT from trucks.
Fact: Damage to roads goes as fourth power of axle load.
Speculation: Given that tires are the primary means to transmit that damage to the roadway, it wouldn't surprise me if the trucks are responsible for the vast majority of tire particulates.
Reference: https://dot.ca.gov/-/media/dot-media/programs/traffic-operat...
I don't have a citation to point to, though!
edit: there are roughly 100x registered passenger cars in the US as semis
You can write me at sebastiano.vigna@gmail.com. Thanks for any info!
BTW, thanks for explaining that you cannot prove things about a single permutation using random permutations--it's so obvious that it is very difficult to explain, and the same absurd argument pops over and over.
Semi truck tires have hard, slow-wearing compounds.
This is why states operate weigh stations — overweight trucks cause significant damage.