Over the weekend we saw a traffic auntie writing a parking ticket for a wayward BMW, so we took a couple minutes to pepper her with some questions:

1. Do you get a bonus for writing more tickets?
   No. No bonus. We have to write 30 tickets and then we're done.
2. What happens if you don't write 30 tickets?
   My pay gets docked 25 SGD. Or if I make a mistake writing a ticket, my pay gets docked again for 25 SGD.

With an incentive structure like that, "30 and done" seems pretty rational.