When using resoluton=23 for level=0 rounding of streets and other objects can go pretty wrong. Or is this just the general rounding problem we have? Principally I think resolution23 should be enough (4.8m accuracy, vs 2.4m accuracy on resolution24) for general use. Using resolution24 I have never seen points getting rounded wrongly (so that a street seems to be broken). Routing is not affected however (no difference at all). I don't understand how one point (a junction of a way is certainly one point), gets rounded to two different places. Neither of the two following options helps/changes anything here: It is not related to the Douglac Peucker algorithm: --reduce-point-density=0 --reduce-point-density-polygon=0 (results in no visual change). It is also not related to --adjust-turn-headings