v3 - now reverses the order of the points in roundabouts that have the wrong direction so that routing is more likely to succeed. ------------ v2 - now prints OSM URL of first point in dodgy roundabout. ------------ As suggested, moved from rhd to dol. Two options are now available --drive-on-left and --drive-on-right. By default, you should not have to specify either because mkgmap now determines the side of the road to drive on from the direction of the first roundabout it processes. But if you don't like its choice, you can specify one of these options to override it. Also, it now issues a warning for each roundabout it finds that appears to go in the wrong direction. I just got 720 warnings when I processed the GB map so either there is a problem with the code or there is a lot of duff roundabouts. I checked a handful of them and they were all wrong. Please give it a go and if you find any of the warnings to be wrong, please post the OSM URL of the roundabout in question. Mark