Notice, also, that this Impala was a 4-door SEDAN model, w/full door frames, & center pillars, so it SHOULD have been somewhat stronger than the "hardtop" models that had no door frames or center pillars...Another thing, these cars had-by today's standards-LOUSY brakes. Discs were unheard of, power assist was an option. They also had relatively primitive suspension systems, didn't handle as well as todays cars, & could be ordered w/engines that vastly overpowered & outclassed the rudimentary braking & handling. The typical highway in those days was a high-crowned 2-lane blacktop, w/plenty of blind curves, narrow places, & other dangers. Speed limits in those days were a lackadasically-enforced 65 MPH in a lot of places, & lmany people went considerably faster. The amazing thing is that almost ANYONE survived...