Roll Over Protection Structure (ROPS) refers to operator compartment structures (usually cabs or frames) intended to protect equipment operators from injuries caused by vehicle overturning or rolling over. Right|thumb| ROPS bar on a Ford Tractor In the UK, ROPS designs have to be certified by Laboratory testing , which will normally require a destructive test to be undertaken. The structure will be tested at a reduced temperature (where the metal is more brittle), or fabricated from materials that have satisfactory low temperature performance.