Road blocks are not going to happen in a broken game engine that only seems to consider a world out to 600m and often spawns enemies within 150m. Its a shame really this aspect of the AI was done so cheaply.
the choppers will blow up your vehicle almost instantaneously. Good luck finding a vehicle with two apache's circling you.
Epic necrobump - literally 3 years.... Unidad can be beaten into submission when you have a good team - that is, you can keep fighting them with a level 4 alert and eventually they will give up and call it off - but there'll be a LOT of bodies and destroyed vehicles left behind.