After a football game, which gate you exist will be determined by where you parked during the game. They push half out the north gate and half out the south. The only way to manipulate this is to have a military ID card and know your way around base so you can back road your way to the gate you want. But for the rest of the fans, you'll be directed to the gate that is convenient. You won't have a choice.
Now some of us will actually stick around and thudgate for another hour after the game. Then when we're ready to leave, most everyone else is gone and it's easier. Leave however you want and very little traffic or stress.