You're right. There isn't any magic "instant salt truck". That's my point. If you're lucky enough to not live in "Holy fug are we ever incompetent, we need to get our shibbet together" Georgia ( Paraphrasing Gov'na Nathan Deal), you have smart folks that send out the trucks BEFORE the shibbet hits the fan and you can't treat the roads because they're covered in cars.
Yeah, I understand. My point was we don't pre-treat roads every day that's below freezing or near it and one some of those days, **** falls from the sky and freezes, frequently invisibly, on the roads. Yet we still don't end up with small scale catastrophes over it. Busy ER nights, sure. States of Emergency, no. It's not that odd, really. I imagine we'd fair very poorly in a 6.5 earthquake or the like.
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