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The Insurance Institute for Highway Safety (IIHS) has begun a new side impact crashworthiness evaluation of vehicles, using tests that represent impacts from large trucks and sport utility vehicles. This test protocol, intended as consumer information rating of vehicles, adds new challenges to current side impact crashworthiness development in both the vehicle structure and dummy responses. Available tests data seem to indicate that safety enhancement features that work for current US-SID and Euro-SID may not work for the SID-IIs dummy that is used in the IIHS test protocol, but may in fact deteriorate dummy response. This may partly be explained by the fact that the SID-IIs is not a scaled down dummy of either the US-SID or the Euro-SID. This paper presents and discusses the results from sled tests conducted to investigate countermeasures that will help improve the response of the SID-IIs in the Insurance Institute's side impact test.