C'mon young fella, are you unfamiliar with the common term used to differentiate CaCl from rock salt "chloride"?.. unless maybe its sodium chloride we load tires with. There is also Magnesium chloride MgCl used to keep dust down on concrete and melt ice. It's more like CaCl than NaCl for its similar properties. "Please pass the chloride and pepper?"

(I guess you've driven less in MI than the 53years I have, ie: since '66)
NaCl is hygroscopic above 80% humidity, so
rock salt is often seen dried on the road or side of you car in a broad ranage of temps. It won't melt ice below 20^ F.
Admit I'm not familiar with what Floridians have spread on their roads when they're icy or any other time, but
MI puts CaCl on dirt roads year around to keep dust down.
MI's true rust culprit
CaCl is hygroscopic above 20% humidity. It will melt ice to below 0^F. Unless your RH is lower than 20% it never dry!! Chloride in dust makes it stick to cars like it does to the road. It 'rusts' cars that drive on dirt roads in warm weather when temp speed the reaction.
There are an awful lot of >10 YO cars in MI that aren't washed every week but stay rust free by staying on pavement. Don't move here.