I've played a number of board and PC-based military strategy games where traveling on a road as opposed to open ground is anywhere from twice to three times faster. At the moment, AH seems to have no differentiation between off and on-road travel, which is a major factor in real tracked vehicle travel.
Right now, a Sherman runs at about 25mph flat out on level, off-road terrain, I believe. In reality, the actual specs on the Sherman indicat it could run 50% faster on-road as opposed to off-road. In AH, that could mean on a roadway it might be allowed to hit up to 35-40 mph.
Adding a few more roadways into and between bases along with faster roadway movement would open up some interesting new aspects to the GV game. The choice becomes to stay on the roadway for faster movement on attack, but possibly having to go through chokepoint ambushes set up by defenders, or avoid the roads, accepting slower movement, but also possibly bypassing concentrations of defenders.
In particular, a roadway up a mountain, maybe even switchbacked, would present an interesting choice to a GV-er in a Sherman (as an example). Go the straight up and over the mountain at 8-10 mph, or follow the longer, but much faster switchback roadway at 20-25 mph (or something like near full off-road speed). I think this would add a bit more of a tactical element to GV-ing and well as adding more variety to the terrain features.
