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Has anyone used or contributed to OpenStreetMap?
(coeus.sbs)
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Wait until you have to decide between gravel and compacted gravel.
But seriously, asphalt and concrete should be pretty obvious. Alphalt is darker and porous, gravel embedded into an almost gooey (when hot) substance. Concrete is flat, often in slabs next to each other, prone to cracking.
Wiki has descriptions for the surface types, https://wiki.openstreetmap.org/wiki/Key:surface gravel seems to be general term that includes compacted gravel, I had to look up difference between dirt, ground and unpaved without text descriptions from the wiki that would have been impossible.
My local Public works committee has a habit of digging up asphalt roads to do water supply pipe repairs, and then filling them up with the rubble when they're done. What category would such a road some under?
Possibly something like
But I'm really not sure. You might find information at https://wiki.openstreetmap.org/wiki/Key:surface and/or https://wiki.openstreetmap.org/wiki/Key:smoothness