This question arose in a changeset discussion . The roads in question are built by laying down crushed limestone and then compacted, both by construction vehicles and also by traffic. Due to the nature of the materials, the surface becomes hard and smooth (This and this photo from wiki are good examples). The discussion point was whether to tag the highways with surface=compacted and some sort of additional tag such as compacted:material=crushed_limestone (in a similar pattern to surface=paving_stones,paving_stones:material) or whether a simple tag of surface=crushed_limestone would be simpler way to convey the same information.
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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/how-to-tag-the-surface-of-highways-that-are-compacted-crushed-limestone/101824