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The Equipment Manufacturers Institute (EMI) sponsored a literature search conducted by Triodyne, Inc. which attempted to identify all “Operator Protective Zones” ever utilized in the world. This effort was intended to determine whether published information existed to define a more compact Operator Protective Zone than those of current SAE (ASAE) standards for possible utilization in developing a new standard for a more compact design of Rollover Protective Structures (ROPS) for small agricultural tractors. The research has led Triodyne to conclude that the Operator Protective Zones upon which the current SAE (ASAE) ROPS standards are based are the only substantiated zones available for possible application to small agricultural tractors.