I gotta disagree. It's a test that's not included in other suites but is included by IIHS because it simulates many accidents in the real world. Tesla's result proves their point very well -- namely, that you can encounter significant safety problems in a vehicle that passes government testing with no problems detected. And in this case it's literally not "just one test." It was repeated, and the failure of the Model S was replicated again, only somewhat worse after Tesla's attempt to correct it. Conclusion: Model S is not an "unsafe" automobile, but it, in fact, DOES have one significant shortcoming. I see no logical point in denying it, even though the US government still rates it as the vehicle least likely to allow injury to passengers of any they've ever tested.