A roll stop plate is rotatably connected to a free edge of the outermost plate such that the roll stop plate is manually folded for stowing, manually unfolded for use and manually raised to a vertical position for preventing a wheelchair from rolling off {HEAD ~ the platform structure} before the platform structure reaches {TAIL ~ a ground level position} 
A roll stop plate is rotatably connected to a free edge of the outermost plate such that the roll stop plate is manually folded for stowing , manually unfolded for use and manually raised to a vertical position for preventing a wheelchair from rolling off { HEAD ~ the platform structure } before the platform structure reaches { TAIL ~ a ground level position }
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