From the Battle Bonuses Gurus: >Roads are *always* considered to have the terrain that underlies them, >except roads that run over mountains, which are considered hills terrain. >(In general all battles in mountains are treated as hills terrain for bonuses.) >A road in a forest is forest terrain, a road through hills is hills >terrain, etc. You have to be careful because the road only goes through >one square at a time, and it's the underlying terrain of that square that >counts, not any adjacent squares. A road can run on plains terrain through >a forest, or run on swamp terrain through hills, or whatever. Road that run >over mountains are unique - units fighting on roads in mountain terrain >are given hills terrain bonuses, but the battle itself only costs >2 movement points, instead of the normal 6 for regular hills terrain.