HI Gerd, that looks like a good start. The attached patch improves on it slightly by ignoring highways that do not have access for cars. Regards, Mike From: Gerd Petermann [mailto:GPetermann_muenchen@hotmail.com] Sent: 03 August 2016 14:40 To: mkgmap-dev@lists.mkgmap.org.uk Subject: [mkgmap-dev] [Patch v1] improve roundabout checks Hi all, attached is a patch for the roundabout checks. It adds a test that will warn when a node on a roundabout is connected to more than one routable way (ways which are not accessable are not counted, e.g. highway=construction with the default style) The check is only performed when option --check-roundabouts is used, you have to enable logging to see the result. The check is implemented in class RouteNode, so a config line in logging.properties might be uk.me.parabola.imgfmt.app.net.RouteNode.level=WARN A binary based on r3688 is here: http://files.mkgmap.org.uk/download/306/mkgmap.jar Note that this check is very basic, it doesn't ignore when the road is going straight through the roundabout or when it builds a tagent. If you think that this produces too many false warning I may add code for this. Gerd