In order to be able to reliably prevent the departure of a vehicle without a locking of the closure device in a cableway with a locking monitor, a second receiving device is provided in the movement direction of the vehicle after the first receiving device. After the start of the vehicle in the first station, the transponder of the vehicle enters the effective range of the second receiving device, and the transponder transmits a signal with the locking state to the second receiving device. The cableway is stopped before the vehicle leaves the first station when the signal to the second receiving device indicates a faulty lock mechanism.