First off, great great website!
Lot of potential.
It would be great to include a direct option "avoid unpaved"; "avoid steep climbs".
You can probably set it up, but it's very unclear for me how.
What i've changed:
assign ispaved or surface=paved or surface=asphalt surface=concrete
assign isunpaved not or surface= or ispaved or surface=fine_gravel or surface=cobblestone surface=paving_stones
My questions is, how to set up to avoid unpaved paths?
Thank you very much!