A device for use in a pipeline including a fluid conduit section constructed of a flexible material. A light beam is scattered by the first display device through the semi-reflecting plate and then reflected by the mirror and the semi-reflecting plate in order to display an aerial image between the semi-reflecting plate and the observation area. When the vehicle owner does not want the third person to use a certain accessory, the owner registers a restriction code in the key. When the role associated with a task or step changes, the facility may assign the task or step to another user.