I'm often out before the roads are treated, and yes, snow plows and salt make a HUGE difference. Half an inch of snow becomes ice when it's packed onto the pavement. The problem with Atlanta, as I see it, is that the mayor knew bad weather was coming, knew they weren't prepared to deal with it, and didn't send kids home from school and close government buildings. Cancelling school for a day or two isn't the end of the world, and it's a heck of a lot better to do it proactively than waiting until the day after the roads are turned into parking lots.
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