Give me five minutes more, only five minutes more...

This idea of giving drivers a ten minute "grace period" before being given a parking ticket seems to me to be (a) ignoring obvious human behaviour, and (b) missing the point.  Firstly all that will happen is that those who deliberately run their parking ticket to the limit will simply add ten minutes to that limit, so whatever problems which are being caused at the moment will still be caused - just ten minutes later.  And secondly, the real problem is mainly caused by asking drivers to have to guess in advance how long they are likely to want to park for.  A system whereby you pay after the event for the time you have parked is fairer and much less contentious.