The second gate is along the approach road but closer to the stadium and is normally clear as most cars have tried to join the queue at the bottom of the field.
I appreciate what you are saying that it would be difficult to get a car out of the gridlocked queue to the gate but in the case of a...
There is in fact a second exit gate to BF which in an emergency could be opened to let out a single car - the situation would be better with the new system as once released from the car park their exit from the ground wouldn't be restricted by a queue of traffic.