>Road damage is a function of the power of 4[1] generally. Per axle. So for instance, if you're comparing an 18-wheeler to a 4-wheel car you have to compare (t

>Road damage is a function of the power of 4[1] generally. Per axle. So for instance, if you're comparing an 18-wheeler to a 4-wheel car you have to compare (truck-weight/9)^4 to (car-weight/2)^4. Or ((truck-weight/9)/)car-weight/2))^4 So if a bus was an 18-wheeler, it would be about 16x the wear units, /32 passengers brings it to half. It doesn't make a difference for the bus you linked, since it's also a 4-wheeler like cars, but if we cared we could add more axles to buses. But, why don't we do that already? Apparently... 1) regulations don't require it 2) we sort of already do; some buses have rear wheel bogies that have 4 wheels of which 2 are kept raised at lighter weights. Which is basically all the time because regulations don't require it. 3) more wheels reduces fuel efficiency (and costs more money), obviously 4) wheels take up space and reduce passenger capacity, which make the bus less efficient if you don't care about road wear 5) buses have a much more consistent weight load than trucks, since ~30 passengers would be only 3 tonnes of difference. I'm wildly out of my depth on buses/trucks here, so if a mechanic could chime in on bus/truck weight distribution and wheels that'd be great.