Just a little open thinking here..
I was thinking more along the lines, of just slowing crosscountry movement maybe 25 or 30%...
Hardball road would still yield max speed..
We would need roads that actually led from one objective to another...
Rivers and creeks, with natural (hard to find) fords, light/med/hvy capacity (destoyable/rebuildable) bridges..
Light bridges=Jeep only, Med bridges= M3 251 and M8, Hvy bridges= Tanks... Medium Bridges could be reinforced to Hvy, w engineer supplies...
M3's carrying Engineer or Demo supps, could build, repair, reinforce, or destroy all bridges... "Those Damn Sappers!!!"
Adding mud/soft ground in a few key spots, here and there...
Hmmm, shaping up nicely!
We have valleys in our terrain already, add creeks and rivers in the places where they would actually exist...
Small villages w destroyable bldgs, at intervals along the main hwy, sprouting secondary and dirt roads leading to secondary stream crossings...
Vehicle spawns would be along the hwy, at a crossroad village, a reasonable distance from the next objective...
Like I said, thinking openly!
RC
The main hwy, would pass thru or near the enemy town and base...