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@stefanveurink68AXD wrote:
.... i need to give the distance between them roads along the full road. ….
The impossibility of this, in my mind, is to define the "distance between the roads." If I space points equally along the lower one [green], presumably the distance from each point to the other road is perpendicular from that point to the other road [red lines]:
It seems obvious that isn't going to be what you want. The points closer to the ends don't even have a perpendicular to the other road.
If distance is perpendicular, that's not the same from each road's "point of view." Here, the distance from the lower road at A to the upper road hits at B, but the distance from the upper road at B to the lower road hits at C.
So which [if either] is the "distance between the roads" there, and where exactly is "there"?
If I do an "average" route between the two road center-lines, and space points along that, the distances [if perpendicular] from the same point to the two roads aren't in anything like opposite directions from that point:
So again, what's the "distance" between them? The sum of the lengths of those two red lines? That doesn't seem right either. The distance between the points where the red lines hit the road center-lines? Even that is greater than the distance from either road measured perpendicular to the other.
If you can be specific about what constitutes the "distance" between them at a given location, and where that location is [on one of them? between them? where between them?], maybe something can be worked out.