motor_vehicle is not understood by mkgmap Actually, why not? If my memory serves right, mkgmap understands motorcar and motorcycle (and maps them to the same access bit), but why not motor_vehicle? For example in my understanding, tractors are covered by motor_vehicle but not motorcar or motorcycle. The road sign for banning motor vehicles does ban tractors too. I assume, it is not converted, because there is no acces bit for it in the garmin format. For motorcar and motorcycle there are explicit bits and can be mapped 1:1 to the img file.
Which two bits would they be? As far as I can tell from the source code, motorcar and motorcycle are treated the same.
I haven't looked into the sourcecode. But on my etrex I can choose the types Motorbike and Car (beside HGV, Taxi and others), so there has to be some difference. As far as I know, these access restrictions are handled by different bits. I personally don't like to have this dependencies hardcoded in the java code. I think it is the use of the style files to map different osm tags (like the motor_vehicle) to specific garmin ones. So each user can do it to his own thoughts and use cases. Regards, Johann