Okay, first off, we simply don't need these roadblocks in the game.
All Checkpoints should be manned if they are to be closed, and if they are manned all they need is the Bargate to be closed, not the roadblock. This doesn't create new ways to get over the border, it simply takes the fun out of being Independent. You expect them to get an MI-8 to cross the border? Then OPFOR will do what they already do and put a ZSU AA Gun on the hill and shoot every single Helicopter out of the sky without any danger. At the moment, if the roadblocks are closed, then Independent simply can't get vehicles across the border anymore, completely sucking the fun out of Independent because forcing them to run 6000m+ is just unrealistic.