Hi Felix, yes, size increases if your style sets mkgmap:has-direction=true. I just want to make sure that the direction flag is treated correctly first. As already discussed we might introduce a new option or tag to tell mkgmap the min. level at which the direction has to be kept. You suggested to ignore direction at level > 0, I think it might depend on the style and TYP. I'll play with the OFM style to find out more. The change should not affect routing at all (none of the changes in the low-res-opt branch should). Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Felix Hartmann <extremecarver@gmail.com> Gesendet: Donnerstag, 13. Mai 2021 02:59 An: Development list for mkgmap Betreff: [mkgmap-dev] Commit 4710 fix error in LineMergeFilter reg. lines with direction The line merger should not merge lines if one has the direction flag set and the other has not. Problem exists also in trunk. Hmm fixing this stopped all the nice size optimization. Map size got much bigger again. I did not find any place where this mattered. Routing was also not affected badly. Maybe I did not look good enough? I do not see why not to merge them. As long as it`s not the opposite it seems fine... Map size increase/decrease is around 1.5% with my style. So thats quite a big difference. -- Felix Hartman - Openmtbmap.org & VeloMap.org