Todd Woody, writing for Quartz:
With no gasoline engine block, the Model S sports a big front crumple zone that absorbs energy and protects passengers in a crash. The car’s massive battery pack sits underneath the passenger compartment, giving the Model S a low center of gravity that helps prevent rollovers—so much so that the company says that during testing technicians could not get the car to flip in the usual way. “Special means were needed to induce the car to roll,” according to Tesla.