A European collaborative group, under the auspices of the European Enhanced Vehicle-safety Committee (EEVC), has produced test methods and performance criteria for pedestrian protection. An adaptation of these test methods has been used in the European Union's Directive for pedestrians and other vulnerable road users (2003/102/EC). EEVC specifies both the physical and dynamic requirements of their impactors. TRL have developed a legform impactor to meet the EEVC requirements. The dynamic performance of the legform impactor is difficult to determine in a simple dynamic certification test because it has three very different injury modes which all need to be activated in the one test. The current version of the legform dynamic certification method has tolerance bands that are wider than normal because the certification test was found to be unduly sensitive to variations in the properties of the Confor(super TM) foam used to represent human flesh. Another factor that has been shown, by Matsui and Takabayashi, to affect the acceleration achieved in legform certification results is the relative humidity, which influences the behaviour of the foam flesh. The main objective of this current study was to further investigate the effects of humidity on the legform impactor certification results.

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