A self-moving tunnel support canopy includes front arch frame, rear arch frame, forward jack, and support jack disposed under the front arch frame. During the transition, an MPEG decoder decodes a transition video signal and provides the decoded transition video signal to a video overlay which overlays the decoded transition video signal onto a display during the transition period. This invention is applicable to processes for the production of a wide variety of commercially important alkylated aromatics, including ethylbenzene and cumene. A deflation mechanism is disposed about the stiffening member and is configured to facilitate the flow of an inflation fluid through the interior volume of the balloon and towards the aperture.