The auto industry seems to have conflicting regulatory actions aimed in their direction. One one hand, they have to comply with CAFE standards and on the hand have to comply with NTSB crash standards.
They have the crash standards rigged. They run cars into a stationary object which presents only the force generated by the kinetic energy of the crash vehicle. The rigging is exaggerated because the kinetic energy of a weight in motion is an exponential factor. So it is much harder for a heavy vehicle to comply against a stationary object. If they ran a Chevy Suburban into a Prius head on, the Prius would be toast.
It all a trick to trap consumers into buying little cars and let them die in them.