Pollution from tire wear is worse than exhaust emissions?

Post by Fjolsvith » Sun, Mar 08, 2020, 8:38 PM UTC

gambiting wrote: post #235

gentleman11 wrote: post #198

Earlier quoted context omitted.

I have been wearing studded slip on crampons when walking my dog this winter. The ice has been ridiculous, I’ve fallen twice already when not wearing them. Not great for the sidewalks, I know, but the dog needs his walks or he would... get sad

I cannot believe a studded shoe would have any impact whatsoever on a concrete pavement. Human weight is nothing compared to that of a car.

Post by Causality1 » Sun, Mar 08, 2020, 8:42 PM UTC

saiya-jin wrote: post #222

kungtotte wrote: post #173

Earlier quoted context omitted.

They're torn up from the road and rubbed off from the tyres themselves. The majority is obviously coming from the road. There's been studies done here in Sweden since we've banned studded winter tyres in some areas of Stockholm in an effort to reduce road wear and improve air quality. I don't know of any sources in English off the top of my head though. The last time I read an article about it though (2+ years ago, d…

That doesn't make sense to me either. Take a busy German highway (as I don't know the average load on US ones), easily 100k cars per day. There are parts of highways which don't get replaced for 20 years easily. Plus apart from tiny fraction of north europe (and maybe Canada?), nobody ever uses studs. Back of the envelope math tells me 1 km of highway would lose some 730 tonnes of asphalt, per year (so 14,600 tonnes…

Post by hef19898 » Sun, Mar 08, 2020, 8:44 PM UTC

helsinkiandrew wrote: post #211

adrianmonk wrote: post #147

Earlier quoted context omitted.

They must have meant grams because that is the basis of their 1000X statistic. The other number is also single digit but is in milligrams. That doesn't mean they're right, but it's the only way I can interpret what they're saying.

But 4.5g/km implies 225kg after 50000 km which doesn’t seem possible. Something definitely smells fishy.

Post by labawi » Sun, Mar 08, 2020, 8:45 PM UTC

gambiting wrote: post #235

gentleman11 wrote: post #198

Earlier quoted context omitted.

I have been wearing studded slip on crampons when walking my dog this winter. The ice has been ridiculous, I’ve fallen twice already when not wearing them. Not great for the sidewalks, I know, but the dog needs his walks or he would... get sad

I cannot believe a studded shoe would have any impact whatsoever on a concrete pavement. Human weight is nothing compared to that of a car.

Post by speedgoose » Sun, Mar 08, 2020, 8:48 PM UTC

amelius wrote: post #70

_Microft wrote: post #32

Maybe offtopic but a surprising bit of extra information regarding wear and vehicles: Road wear scales with the fourth power of axle load, so heavier vehicles do much more damage than one might expect. Take a 40t truck with 5 axles vs. a small car with a weight of 1t and two axles (e.g. VW Polo, maybe an older VW Golf might only weigh 1t as well): (8t axle load / 0.5t axle load) = 16^4, i.e. the truck puts 2^16 (6553…

> Road wear scales with the fourth power of axle load, so heavier vehicles do much more damage than one might expect. Yes. Electric vehicles with their heavy batteries also make things worse.