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A possible Solution to the Problem I found working is a step-by-step solution which looks like this: BEGIN; CREATE TEMP TABLE route ON COMMIT DROP AS SELECT seq, source, target, km, kmh, clazz, geom_way FROM pgr_dijkstra('SELECT id, source, target, cost FROM de_2po_4pgr, (SELECT ST_Expand(ST_Extent(geom_vertex),0.1) as box FROM de_2po_vertex ...



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