Hi WanMil, I tested a few routes and see nice improvements regarding the calculation time on the device staying at home, so I have no idea if it also improves the turn left/right messages. Regarding the changes in the source code please check: The method mergeRoads() is called before the other routines that manipulate lines. If I got that right this can cause trouble with the continue statement in the style which produces overlaid lines and the loop in StyledConverter following this line: // make sure that copies of modified roads are have equal points Not sure, but I think the roads which were merged should somehow appear in the deletedRoads or modifiedRoads ? Gerd -- View this message in context: http://gis.19327.n5.nabble.com/mergeroads-branch-tp5776711p5778221.html Sent from the Mkgmap Development mailing list archive at Nabble.com.