Still seeing issues, now using build 915 - it starts with an OSM route, then becomes goes straight from Colsterworth roundabout ("2nd exit to A1") to Worsley ("Right on M61). It does estimate 2 hours between the two, and it may be relevant that this segment crosses an east-west boundary (and west of the prime meridian). I routed the reverse journey, and after very long calculation ended up with something similar - though it was now the beginning that's routed on the basemap (i.e. the same area as in the forward journey). I'm using a GB extract[1], split with splitter.jar. Is it possible that the sort criterion is not as presumed on the east and west sides of tiles? [1] <URL: http://download.geofabrik.de/osm/europe/great_britain.osm.bz2 >