This guardrail has no terminal, only a blunt end piece of steel to pierce the car and kill the occupants. This terminal penetrated the car Judy Bird was a passenger in and decapitated her. They had to take 16 feet of guardrail with the car, because it had penetrated the car and was sticking out the rear window . A 10 year old could have done a better job of engineering than this if you call this engineering. This terminal was turned down into the ground to prevent spearing but causes many smaller cars to roll over.
Rollovers are the most severe type of roadside crashes.
The BCT is called a boxing glove and has a round front. The melt is a glorified BCT and has been redesigned and tested several times. It has finally passed the last crash test but under questionable soil conditions. It should be illegal to use at this time, unless the FHWA has approved it. The kill rate will be much higher than the ET-2000.