Terrain Protection

[Imp]

Fair point on the dunes, as to roads rail I assumed negates terrain below for the following reason.
If you mouse over roads etc it just says road, other combined terrain lists both so assume its cumulative as in trees, clear or trees rough. So take it if in a road hex you are considered on it not in the other terrain, also based on fire at units in rough road vs rough from observation they seem more vulnerable on the first.