The cameras on entrance and exit are fair enough in the sort of places I live where there are not enormous queues outside and where the time taken from leaving a space to exit of the car park is 5 minutes or less.
Cameras recording the exit time where you may have left the space 20-30 mInutes or more beforehand beforehand are taking the p, effectively charging to queue.
The ones local to me charge from paying the ticket machine onwards with no timing at exit or recording entry time and treating the paying at the ticket machine before exit as close enough to the exit time, don't really have much of a problem with these.
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