[beamgirl]

So the whole rigid box thing is kinda a "they dont make em like this anymore" myth. Here's a 1959 Chevy crashed into a 2009 Chevy https://www.youtube.com/watch?v=C_r5UJrxcck. They both crumple, but the 2009 only crumples in the crumple zones. The crumpling on the 1959 impala is more spread out and you can see includes more of the interior

[ceejayoz]

It's less about that sort of crash and more about small fender benders. You're likely to get much more bumper damage hitting a car at 5 mph in stop and go traffic in a modern car. (The upside being, of course, you're a lot less likely to snap a pedestrian's leg in a similar hit.)

[beamgirl]

More bumper damage sure, but even at a couple miles per hour, a car where the bumper bolts straight to the frame moving at a couple miles an hour has to dissipate that energy. I'd expect to see some bent metal. My 82 bronco actually has a foot of steel bars that act as sacrificial bumper mounts so the frame doesn't take that impact.