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Jet transport means vastly increased velocities at takeoff, flight, and landing. These velocities build up correspondingly high kinetic energy that increases the hazards of crash landings if not dissipated. But jet safety design standards have changed little from those of the piston engine, even though there are sufficient statistics available for design purposes. In addition, the limits of human tolerance to injury have been determined with sufficient precision to provide minimum standards for safety equipment. If these data were applied to modern aircraft design, many fatalities occurring today could be prevented.

THE problem of crash protection for ground-vehicle occupants relates not only to the general public but involves the Armed Forces inasmuch as there is a tremendous loss of man power to the defense effort from motor vehicle accident injuries. Evidence for the need of safety devices in ground vehicles in order to improve their crash-protection characteristics is recommended. Specifications for lap belts and lap belt installations are described, and the use of these belts in priority vehicles to evaluate their effectiveness is recommended. The three fundamental harness configurations are briefly discussed.