Abstract: A ramp assembly to accommodate a wheel-chaired passenger to enter or to exit a passenger vehicle. The ramp assembly includes a frame having a drive assembly and a ramp subassembly slidably coupled to the frame. The ramp subassembly includes a ramp and a side rail extending along a side of the ramp. A ramp linkage is pivotally coupled to the ramp subassembly. A wheel is coupled to the ramp linkage, wherein rotation of the wheel adjusts a position of the ramp linkage to move the ramp from a lowered position to an inclined position. The ramp subassembly further includes a rail bracket, pivotally connected to the ramp linkage, and a slide bar, located adjacent to the rail bracket. The slide bar is configured to slide along the rail bracket, wherein sliding movement of the slide bar raises and lowers the side rail.