Abstract: A ramp assembly for use in a vehicle provides access thereto by users having reduced mobility. The ramp assembly comprises a ramp platform displaceable relative to a mounting structure between a retracted position and a deployed position. A drive mechanism is disposed within the mounting structure and operable to displace the ramp platform between the retracted and the deployed positions. The drive mechanism includes at least a drive shaft and a bidirectional motor unit selectively actuable to rotate the drive shaft in a first direction for deploying the ramp platform and a second opposed direction for retracting the ramp platform. The drive mechanism includes a pair of flexible transmission elements each interconnecting the drive shaft with a lateral edge of the ramp platform, for displacement thereof relative to the mounting structure.