Curb height, metres.
Surface height above the ground, metres.
Sidewalk width per side, metres (0 = rural: a sloped verge instead of curbs).
Smoothing passes over the centreline height (removes bumps of the ground).
Resampling step along the path, metres.
Width of the verge (rural) or sidewalk skirt sloping down to the ground, metres.
Carriageway width, metres.
Shape of a road ribbon. Plain JSON.