[Tagging] Feature Proposal - RFC - Kerb

[Richard Mann]

kerb=flush would mean that there is a kerbstone (with all the
potential for localised puddling, misalignment, settling etc), whereas
kerb=no would mean there's a continuous tarmac surface - the latter
occurs either if someone is trying to make a very smooth transition
between the road and a cycle track, or if the pavement/sidewalk is
only delineated by a painted line (you get this on narrow village
roads, sometimes)

the normal UK term for a "lowered" kerb is "dropped"