My mate works at a university and he gets round this by buying one day ticket a month for a quid.
You're supposed to scratch the day off you're using and display it, but he hides that bit under his tax disc.

The most amusing part is that he lives so close to the univeristy it's actually less distance and quicker to walk through the as the roads are perpendicular to his direction of travel. His battery went flat recently.
( Slippery Mick ‏, Tue 2 Sep 2014, 13:24, Reply)