I have to replace my tires every 60 000-100 000 KM as the tires wear down and the rubber comes off as I drive. If this is happening with all cars, why arnt the roads coated in rubber? Is somebody cleaning the tire rubber off the road? Is it getting washed away from the rain and into drains/the ocean? How long does it take for rubber to degrade that has come off the tire?
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This answer is slightly off-topic, but related to your question: Airplane tires absolutely deposit rubber on runways, and it’s a regular chore for airports to [remove the rubber.](https://en.wikipedia.org/wiki/Airfield_rubber_removal) If they don’t, rubber on the runway will significantly affect braking performance.
Airplane tires are subjected to much greater forces than car tires, though. Those tires lose so much rubber that they need to be replaced every 500 landings at best, which equates to a few months for most commercial airliners.
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