The red sign with a white horizontal stripe means no-entry, go the other way follow the big white arrows, they provide a clue.
There is a very good reason not to exit onto Stockport road at the entrance, I've been knocked off my bike once (& to the driver of said Nissan Juke, 'fat' in not insulting, it's a fact) and I've had a mini collision in the car too for which I'd have been onto claims direct is I could be bothered.
Just go round the right way, it's only 10 yards further.