During those hours the control tower is in operation, no aircraft shall be taxied or towed prior to getting the airport control tower clearance for such operation. During those hours the control tower is closed, the pilot’s responsibility is the same as at uncontrolled airports. The pilot in command of the aircraft is responsible for avoiding a collision with other aircraft, persons, or objects on aprons, ramps, taxiways, etc. (Added by Res. adopted June 24, 1974).