Thi standard specifies the safety requirements for safety cabs and safety frames fitted to agricultural wheeled tractors. It lays down procedures for testing compliance with these requirements, in order (a) to establish whether the safety cab or safety frame may be expected to adequately protect the driver from being crushed during an overturning accident of a type likely to be encountered during practical agricultrural work and to (b) investigate practical features likely to affect the driver or the use of the tractor.