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It would depend on the severity of the impact, the size of the car that hits you, the speed differential, and many other things.
I saw a photo of an S rear-ended by a semi, and there looked to be minimal intrusion. I saw a photo of an S rear-ended by a police cruiser, and there was some damage, but again the occupants of the RFS would likely have been safe. And then there was the story of the S rear ended by a drunk driver in an SUV, where the SUV completely obliterated the location where the RFS would have been (I don't think the driver had them, but the reinforcement wouldn't matter as the SUV drove OVER that area, not INTO).