Abstract: A filler neck for a fuel tank used on busses achieves higher filling rates by varying the geometry and cross sectional size of the filler neck depending on local slope of the neck and available space to fit the neck, particularly between a bus chassis frame rail and the bus body floor.

Abstract: A presentation aid employs a translucent panel having a milky appearance and which is back lit by a number of illumination sources, each source illuminating a specific portion of the panel. Baffles separate adjacent illumination sources so that light from one illumination source does not substantially illuminate a portion of the panel associated with other illumination sources. A sheet of information carrying material passes between the illumination sources and the back of the panel, such that the information on the sheet is not visible at the front face of the panel unless an illumination source is activated behind the information. The various illumination sources may be selectively activated to provide controlled viewing of the information. Rollers wind and unwind the sheet of information carrying material in response to operator command to allow changing of the information.