Abstract: In order to provide an apparatus and a system for determining compliance with parking rules by a vehicle, the apparatus (1101) comprises means for receiving a signal representing a location selected from a plurality of locations, rule storage means (1102, 1103) for storing parking rules relating to the plurality of locations, means for obtaining from the rule storage means (1102, 1103) a rule relating to the selected location, means for determining if a vehicle parked at the selected location complies with the rule and means for transmitting a compliance signal representing the compliance determination. The apparatus can be used in conjunction with vehicle observing means (1400) to determine if a vehicle is incorrectly parked.