As announced yesterday - here is a patch against the default-style-file to heavily improve Autorouting for cars/motorcycles. Attached is a patch that should increase Autorouting distance without errors in Mapsource by 30-100% (distance as in number of turns). I am not sure how the maxspeed is currently handled in mkgmap code. In case that maxspeed can actually increase the road_speed, then it has to be used with --ignore maxspeed - Best would be if maxspeed (in case it is tagged) can only decrease road_speed, but not increase it - I am not sure whether this is current behaviour. This patch does blows up mapsize by up to 10% - depending how well mapped a country is (the better it is mapped, the smaller the increase). For Germany it is around 4% size increase. (only 3% if zipped by 7-zip). Using it I had no problems routing from South Spain to Northern Poland in Mapsource and several other as long distances, Map rendering time does not significantly increase. I additionally put add bicycle=no; add foot=no for trunk roads, as in 99% of cases you are not allowed to use them as a cyclist/foot (nor would you like to) - at least in Europe.