You exagerate. A 50 pound block of ice would be about 1 ft thick, 2 ft. by 3 ft. and it would be solid ice not the crackly, crumbly stuff normally on cars.
I live in Maine. Every winter I see a dozen or so cars on the road after every big storm, with just a peep hole for the driver to look out. They are usually all over the road and "shedding" snow and ice like a dog with mange. I cringe when I see them coming. If you can't get your lazy a-- out of bed a few minutes early to clean off your car, maybe you should sit in the slammer until you smarten up. I hate the nanny state too, but getting dangerous individuals off the road seems legitimate to me.
I hate to burst your (frozen) bubble but what you described, a 1' x 2' x 3' cube of ice, would weigh. apx 330 lbs.
A cubic foot of fresh water weighs about 60# - significantly smaller than the 6 cu.ft. piece you're talking about.