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A new technique for body/frame cars to predict the vehicle collapse, velocity, and deceleration histories in a barrier crash at any speed between 10-30 mph has been developed. This approach requires data interpolation from a minimum of two, and preferably three, barrier tests conducted with no additional instrumentation than that already present in today's standard testing. Potential savings could be derived from using this technique to reduce the number of barrier tests that would otherwise be necessary for checking safety restraint performance throughout the crash speed spectrum contained within the test boundaries. Good correlation with tests was obtained with the 1969 Ford car line. Application of this technique to the 1971 Mercury showed similar favorable results, Applicability of the equations to body/frame configurations other than those tested has not been determined.