Key:surface:middle
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 surface:middle
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Describe what is in the lengthwise centre of an inhomogeneous surface. 
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| Group: properties |
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| Status: in use |
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When the surface of a carriageway is not the same, where the wheel tracks are, and in between: This key maps both the fact, that the surface is not homogeneous, and what covers the middle of the way.
Examples
A so-called Tractor-Path may get: highway=track + tracktype=grade3 + surface=asphalt + surface:middle=grass
A driveway may get: highway=service + service=driveway + surface=paving_stones + surface:middle=grass_paver
See also
- surface=concrete:lanes - Narrow concrete elements placed in lanes.