Abstract: There is provided a parking monitoring system comprising one or more sensors adapted to be deployed within a parking slot; a controller unit adapted to be connected to the one or more sensors for receiving information from the one or more sensors when a vehicle is parked in the parking slot, wherein the received information comprises activation and de-activation signals of the one or more sensors; and wherein the controller unit is adapted to determine whether the vehicle parked within the parking slot is allowed to be parked inside the parking slot based on the received activation and de-activation signals. The system is particularly adapted to monitor whether vehicles of certain categories such as bicycles, vans, cars and trucks are parked within their respective parking zones reserved for these categories of vehicles.