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Re:Ask HN: how do I trace routes in a geospatial db? by rekky123 on Tuesday February 28, 2012 @10:47PM (#3646331)
Look into: - PostGIS - Mapnik - OpenStreetMap

And prepare to spend more like 20 weekends on this -- it's not a trivial problem. Or, use Google maps and cut that time investment way down.

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