Lots of football clubs do not allow cars to move until all pedestrians have dispersed, I remember missing our train in our last away game at Blackburn the other year as we jumped on a bus to town, it didn’t move for ages which is why lots of fans of “big clubs” leave with 5 or 10 minutes of the game remaining....
Parking in the overflow car park has always been a nightmare however parking behind the East stand has improved no end with the traffic management however it does fill up rather quickly especially over our last 3 home matches...!