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Tires and brakes already do that. This would just do it more.

Not "just". More, more, more microplastics.

asphalt is already tar/oil anyway, wouldnt make up that much of a difference I'd think.

If it is an organic compound it is probably going to breakdown in years or decades. (Crude oil spills AFAIK only have a relatively short term impact).

Most plastics seem to take centuries before they are back to something that is less noticeable in the environment.

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