Start node id.
Who may use it.
End node id.
On a bridge deck.
Edge id.
Lanes per direction (two-way everywhere).
Length, metres.
Graded centreline [x, y, z] (frame-local), from a to b.
Sidewalk width per side, metres (0 = rural, no kerbs).
Speed limit including the surface's slow-down, m/s.
Surface.
Class.
Carriageway width, metres.
A road edge as plain data, with what vehicles and prop placers need.