Key:surface:grade

surface:grade
Description
Poorly defined tag for tagging surface quality with numeric code, consider using smoothness=* instead  
Used on these elements
Useful combination
Status: in use

Tag proposed in Proposed features/Surface Quality with some use, primarily in Australia.

values ranging from 0 (very, very bad) to 3 (excellent).

Consider using instead surface=* and smoothness=* and tracktype=* that are used far more widely.

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