1 inch in Chattanooga and it was a mess. Not as bad as Atlanta, not by a long shot, but several people had a very long, slow drive home yesterday afternoon.
In defense of Atlanta (maybe defense is the wrong word), that city is just one "fender-bender" away from traffic chaos anyway. It has way too many cars for the amount of road/infrastructure as it is. Throw in slippery roads and you have a complete mess.
And no, southern cities don't have fleets of salt/plow trucks standing by like they do up north. It wouldn't make sense to spend that kind of money for trucks that they'd only use once every 3 years or so.
Up north, here in upper east Tennessee, we have all those trucks. They are the ordinary trucks that are temporarily outfitted with salt dispensers and blades. The DOT uses dump trucks out fitted with tanks that dispense a liquid on the Interstates. It is very effective.
Our experience today is almost unique in my memory. We had light snow falling for hours on end at 15 degrees or less. We had what we skiers prayed for but never ever got....... powder. The accumulation is now bout 4” and the temp is 4 as well.