Possible to do in CDLC Global Mob. But I agree. It was possible in the previous arma games, but was turned into map/terrain entity (non-destructible) to better prevent the AI from getting dangerously confused when facing the issue of : crossing a structure that exists as part of the terrain but still is handled as a structure.... that they must drive over.... and the structure and the terrain aren't the same which confused the AI pathfinding, sometimes leading to AI trying to bash through guardrails. Can be seen on the ported maps.