{HEAD ~ A roll stop plate} is rotatably connected to {TAIL ~ 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 the platform structure before the platform structure reaches a ground level position 
is rotatably connected to
{ HEAD ~ A roll stop plate } is rotatably connected to { TAIL ~ 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 the platform structure before the platform structure reaches a ground level position
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH