If millions of tires have been worn down on the roads then where does all that worn off rubber go?

Question

If millions of tires have been worn down on the roads then where does all that worn off rubber go?

In: 7336

Answer 1

Decades ago I worked in a blacksmith shop that was directly below I 5 in Seattle. There was always this black dust everywhere in the shop. We calculated the number of cars that were on the freeway above us, and for the one mile of freeway and the average number of cars, we calculated that two tires were ground to dust every day above us as the source of the black dust. Now multiply that by all the highways in the country…