system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do we not notice rubber on the roads if tires slowly wear down on them?

Why can't we take our hand, touch the road, and feel rubber? Might be a silly question, but this question got me thinking in the shower this morning.
gpt
The tiny grains of rubber leave the road in two ways. 

1. They are washed away by rainwater, ending up wherever the drains or ditches near the road lead.
2. They are carried away by the wind. Buildings right near very major roads often end up with a fine layer of rubber and dirt on them.