Hi, I'm doing similar processing for cgpsmapper. My algorithm is following: First I try to remove very short lines. I don't remove lines which are a part of roundabout, restriction or road sign. I check ending nodes of short lines and don't remove lines if any node is external (on tile boundary). I merge nodes and move them to the middle of removed line. But if a node connects to multiple short lines, I leave it at original position (this is mostly to preserve integrity of network). Then I try to extend remaining short lines. I move both ending nodes unless one of them connects to multiple short lines. I'm working with floating points coordinates but I round coordinates to 24-bit equivalent to calculate length. I remove only the shortest lines, where difference between ending coordinates is no longer than 1-bit in 24-bit range. I simply hope there won't be problems like removing whole bridge. I don't know what is real Garmin condition for short line. Cgpsmapper uses distance 2.4m. I would rather expect that condition is based on 24-bit coordinate grid. Would be good to know precisely, when line is too short, this would minimize the number of changes. -- Best regards, Andrzej