Myra43 blog page, he will helpful and I have permission to post this method there... After, I will show my method of some modeling part. May it will video or text, will see.
As I say before, Invest time to look for good impressive road. It must to be interesting not just for you, but for others people to as RBR community. Otherwise, just lose time and don't have feedback and interest. Job without it is nothing...I try a lot, huge size (epic size :D) tracks, just one time and never back on again. I don't think, that you want make track just to drive once. So, I recommend to find nice real tracks from WRC, may some super special. At this time we have good service from there as WRC+ and you can to see every onboard from every rally event, it's very helpful to take josie and after in workflow.
Read text below...
I leave original text there, so sorry for mistakes...
001 - on server www.openstreetmap.org wee locate territory. Press the button Export, and then Manually select a different area.
http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Eurasia/, the plugin will tell the picture again.
The base line is so ready and we can try to export the Wallaby or continue creating detail lines (ditches, hedges, etc.)