Hi Gerd, I have tested your patch with following rules: junction=roundabout & (highway=primary | highway=primary_link) & mkgmap:option:render-roundabout!=true [0x0c road_class=3 road_speed=2 resolution 20] junction=roundabout & (highway=primary | highway=primary_link) & mkgmap:option:render-roundabout=true [0x0c road_class=3 road_speed=2 resolution 24 continue] junction=roundabout & (highway=primary | highway=primary_link) & mkgmap:option:render-roundabout=true [0x10802 resolution 20] All worked as expected, thanks! You have implemented warnings other way, than I have expected. It's good but you still can add another check: for each tag in styleOptionTags check, if tag exist in style. Or maybe if tag is used? If not, then something could be wrong - user have put option in command line, which is ignored. -- Best regards, Andrzej