All over Australia parking officers used to chalk mark tyres (still do in many places) by leaning down and swiping the tread. Their backs must have been destroyed at the end of the day (and a good thing too!)
We now have ground sensors in each spot and the second you overstay your welcome the machine back at headquarters starts printing you a nasty bill.
Little buggies with number plate recognition are now beginning to be seen and they just zip regularly around the block jagging late stayers as they fly past.
Oh how the money rolls in.
Lang
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