This SAE Recommended Practice is intended to establish guidelines for conducting passenger car roll-over tests so that data obtained by various test facilities may be more readily compared. A description is provided of the facilities and procedures for a curved rail-ramp technique, which has been found to be successful in producing roll-overs. Techniques and instrumentation for the study and evaluation of vehicle structure effects and occupant movement resulting from roll-overs produced by the curved rail-ramp system are also specified. The curved rail-ramp procedure has been evolved from laboratory and field studies and tests which have sought to establish procedures which would provide realistic simulations of roll-over accidents without collision, and which would be reproducible among laboratories and between different types of passenger cars. The original issue of SAE J857 described ground level and hill roll-over techniques.