| 摘要 |
<p>A vehicle park has potentially available parking bays for vehicles arranged in groups of parking bays, the groups being arranged in a hierarchy such that successive groups are located further from an entrance for vehicles than preceding groups. Each group has an associated controller linked to individual sensors associated with individual parking bays of its group. Each sensor is adapted to detect the presence or absence of a vehicle in the respective bay and to communicate such presence or absence to its controller. Each controller is linked to a respective indicator adapted to give an indication of the number of vacant bays at any time in the group to which its controller belongs.
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