Model X is designed with safety as the first priority. The floor-mounted battery lowers the center of gravity so that the risk of rollover is about half that of any vehicle in its class. The battery structure strengthens Model X against side impact intrusions. And without a gasoline engine, the large front trunk acts as a giant impact-absorbing crumple zone. Although the National Highway Traffic Safety Administration has not yet conducted crash testing on Model X, Tesla's own internally conducted crash testing indicates that Model X should be the first SUV to receive the highest safety rating in every category.