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Protective helmets a investigatons by the road Research Labora- tory: British Standards Institution mehod of testing helmets. Motorcuclist injuries. Crash injury investigations in Great Britaina On-the-Spot studies of accidents;examination of vehicle damagel injuries to occupants.vehicle defects;safety glass for windscreenssafety beltssafety harnesses. Crash injury investigations in the U.S.A.