Having driven extensively in nearly every city in this country, the drivers in Atlanta are absolutely the most dangerous. It is the only city I refuse to drive in, and I try to limit my physical presence in the Atlanta Metro (aside from transiting the airport) to reduce the risk of being in an accident.
I have seen a mid-90s Nissan pickup truck literally on two wheels it was weaving through traffic so recklessly on I-85.
LA, New York, Boston, Chicago, Miami, Seattle, Bay Area, Houston, Dallas, etc. They all have their bad drivers, but none of them seem to have this deeply ingrained culture of reckless driving quite like Atlanta.