Trigati
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I guess that in a crash the normal bumper would compress but then till transfer the impact straight to the chassis.
In this case, after the flex of the shell there are little V pieces of what is probably lexan (like little springs) which then absorb a little more before transferring the impact onto the bumber. With the u shape I guess the bumper would not only compress but also the prongs would bend absorbing more impact prior to transfer to the chassis.
So unless the ipact was a pole, right in between the prongs, which may just be able to impart all the impact to the chassis if you're luck was zero, I would suggest that it's probably more efficient.
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