parce que le centre de gravité est tellement bas sur une Tesla, dûe aux batteries sous le plancher du véhicule, qu'il est impossible de lui faire faire du tonneau avec la facon usuelle des tests.
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Later, Musk explains: “The Model S was also substantially better in rollover risk, with the other top vehicles being approximately 50 percent worse. During testing at an independent facility, the Model S refused to turn over via the normal methods and special means were needed to induce the car to roll. The reason for such a good outcome is that the battery pack is mounted below the floor pan, providing a very low center of gravity, which simultaneously ensures exceptional handling and safety.”
source:
http://www.businessweek.com/articles/2013-08-20/teslas-model-s-sedan-destroys-safety-tests-dot-dot-dot-literally
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