[mkgmap-dev] Option : Need of drive-on-left option ?

If you use the option --check-roundabouts you candefine -drive-on-left or --drive-on-right. But if you have input data from more than one country this is sometimes not easy to define. But in the past more and more people use the bounds option. Cant be decide on with side of the road we should drive from the infos out of a bounds file ? Greeting Flacus