Atlanta is a very hilly city, so icy roads here are more dangerous than icy roads on flat terrain. I believe I've heard that most northern states do not legally permit roads to be build with such steep grades as are common around here, as they would be useless for much of the winter.
(I know I would not want to walk up the big hill from east campus to the library at Georgia Tech when it is icy.)
When it snows here the weather also tends to hover right around the freezing point, allowing the snow to partially melt and re-freeze multiple times. The ground is not usually below freezing when the first snow falls, so it melts quickly and does not get old enough to refreeze until the pavement is soaking wet, causing a sheet of ice below the snow. That is much more dangerous than a thick later of snow which remains fully frozen.
Also, given how rare snow is, we do not have enough snowplows, road salt, or tire chains.