This type of application generally requires a system that keeps a record of the vehicles entering and leaving the car park and displays the number of free spaces at the entrance. It must also prevent the barrier control from allowing vehicles to enter when the free spaces count is less than one.

When the car park is empty, the count value is set to the total number of parking bays. This value is displayed at the entrance. As each vehicle enters the car park, the count is decremented. As each vehicle leaves the car park, the count is incremented. The counting system will prevent the entry barrier from allowing vehicles to enter whenever the free spaces count is less than one. Optionally, the display may also show 'Full' when the spaces count is less than one.

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