I tried to use PostGIS's ST_ApproximateMedialAxis to convert a long skinny area in #OpenStreetMap into a line, but the results weren't very good. Here's the script if anyone's interested
One big problem is that the output geometry that this PostGIS function generates is weird and funny, and no very suitable for direct use in #OpenStreetMap. There's lots of little ways, and the direction changes a lot.
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