Quote:
Originally Posted by 1991F250
... But, even just considering the weight of a vehicle... your Impala, my Grand Marquis weigh in very close to sedans produced today, even though they lack almost all the safety features mandated, so can it truly be a weight issue? Or is something more in play? ...
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The reason it doesn't make sense is that you're trying to extract a logical explanation where there is none. Automobile design is much more like haute couture than engineering. Look back a little further and you'll see the size & weight of full-size Big 3 sedans going up & down like skirt hemlines.
Late 1940s, 1950s - cars got bigger & heavier, hemlines were calf-length
Early-mid 1960s - cars got smaller & lighter, hemlines went up.
1966 - Federal Motor Vehicle Safety Act enacted.
1966 - Front-wheel-drive Oldsmobile Toronado introduced.
Late 1960s, early-mid 1970s - cars got bigger & heavier, FWD Cadillac LD introduced, hemlines went above the knee.
(in 1977, GM dramatically reduced the weight of their full-size cars and quit offering big-block V8s)
Late 1970s, 1980s - cars got smaller & lighter, hemlines went first to the ankle, then back up. To confound matters, the sport-futility vehicle emerges, which the automakers certify as light trucks but market as family cars.
1990s - cars gradually got bigger & heavier, hemlines went up, then back down. GM begins building FWD Impala.
So don't read the the tea leaves looking for a correlation between weight and federal safety regulations. The fickle finger of fashion is actually in control.