Folding rollover protection system

A folding rollover protection system (11) includes an upper ROPS (15) hinged to a lower ROPS (14) and movable between an upright position and a folded down position. An isolation member (25) may be urged between the upper and lower ROPS (15, 14) to separate them from each other. The isolation member (25) may be a resilient wedge-shaped member positioned between a first wedge (30) and a second wedge (31). The first wedge (30) is movable toward the second wedge (31) to urge the isolation member (25) against one of the ROPS (14, 15), isolating the upper ROPS (15) from the lower ROPS (14).