Okay, the poll is over and I can see the result is quite clear - thanks you for your input, will modify my archive maps accordingly and will keep it in mind for future maps.
__________________
This post, as well as being an ambassador of death for the enemies of humanity, has a main message of peace and friendship.
It's late for the poll, but I throw my 2 cents in anyway.
why not leaving tertiary roads plain flat terrain while adding high grass/crops/leaves/rough/sand/whatever to non-roads hexes representing the country? This would make it for the look and for the MP cost where a difference is needed.