As a motorcyclist, do I have to use the priority lane when it is quiet?

To access the ferries during the Control Tower manned hours, motorcycles and bicycles must queue in lane 7 at Torpoint and lane 11 at Devonport and adhere to the traffic control signals, waiting to be called forward on demand.To access the ferries when the Towers are not manned, motorcycles and bicycles must use the open traffic lane (green light at lane entry and exit). In both cases, once at the slipway, motorcycles and bicycles must follow the instruction of the ferry loader.