I've noticed that routing breaks if I search for an address, where the street consists of multiple lines in the style file. For instance a tertiary road plus a tunnel. Or a bike path with a cycle route. In those cases both lines were routable. In cases where I use overlay lines (with the continue statement) that are non routable, routing doesn't seem to break. On Mapsource or on the GPS it routes fine if you point to that road on the map. With the address search on the GPS however, the street is found but if i want to calculate a route, the device says either 'there are no routable streets' or the route makes very weird jumps to the tile end and bounces back to to the destination in a straight line. I think I can prevent this behaviour by using non-routable lines for overlays, but maybe some improvements can be made in the mkgmap code?