Not that difficult to get some good results with this simple method:
Using DxTBmp, send the texture to Photoshop (or other editor).
Change the file to black and white mode.
Increase contrast by about 70 %
Increase brightness by about 30 %
Change back to RGB mode.
That's it.
You might want to experiment with brightness and contrast levels.
Note that all roads will be unplowed
If you want to have some colour, you need to overlay the original texture with this one and use a 5% eraser on the areas you want to have colour.
Hope this works for you!
Sascha
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