A ramp (2) to give wheelchair access to a bus (4) comprises a raisable and lowerable platform (26) pivotably mounted on a supporting frame (14) and a further platform (28) extensible beyond a front end (32) of the platform (26 ) and retractable relative to that platform. A fluid pressure operated piston and cylinder unit (58) below the ramp is arranged to act between the platfor ms to extend and retract the platform (28) along a line of action A. The unit (58) acts along a line of action B which is transverse to line A. The supporting frame (14) is U-shaped with horizontal open ended slots (82 and 8 4) at the front ends of its arms. Similar platform slots are formed in two opposite sides of the platform (26) adjacent its front end (32) and each platform slot coincide with the respective slot (82 or 84) when the platform (26) is in a raised position. When the platform (26) is in that position and the platform (28) is fully retracted lateral flanges (86 and 88) on platform (28) enter the corresponding slot (82 or 84) and the corresponding platform slot in platform (26) so the flanges can rest on the lower sides of the slot s (82 and 84) and support the raised and retracted ramp.
