Asphalt
- There's quite a bit of asphalt recycling.
- Hot asphalt releases toxic gasses which is not healthy for workers
- It's not as bad ad with rebared concrete but tearing asphalt up againg is loud slow and energy intensive
Just as with concrete asphalt is one of the cheapest materials around. So competing with it is hard.
Still, given that advanced productive nanosystems only need will need air sun and time (once the code is written)
asphalt will most likely be outcompeted.
Just as in 3D printing generating and replicating complexity in gem-gum metamaterials comes for free (once the code is written)
So just about anything can be integrated into streets no matter whether sensible or not.
Misc notes
Just as with farming a good idea might be to (fully automatedly) put roofs over all street.
In dense cities the materials for above ground layers for traffic could be taken directly from the material that needs to be removed for some underground tunnels.
Given there are some suitable materials like oxygen silicon aluminum calcium (very likely!).
This related to underground working and mining including soil processing.
See: Upgraded street infrastructure
