I'm working on a TileMill project essentially displaying freight routes. The original shapefile contains a origin city and a destination city (and a path between both cities). When I apply a marker-type:arrow; /marker-placement:line; code in CartoCSS, I just don't quite understand the logic of how arrow direction actually gets assigned in this case. Ideally obviously I would like the arrows to point in the origin city to destination city direction.
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