Some of the Fall of France 1940 scenarios have hidden roadblocks. I cannot find a roadblock counter so I used the User defined terrain piece for a roadblock, but this cannot be hidden. So in a HtH game we just used a minefield counter that could be hidden. Either I'm not seeing the roadblock or this might be something that needs to be made.
My apologies for taking so long to get back Fred.
Roadblocks are part of the map extension TM-Western theater. I made 3 terrain mod extensions to cover some of the game specific map counters.
I've made a change from the original version to allow roadblocks to be hidden.
... More and more, people around the world are coming to realize that the world is flat!