I drove through Illinois recently, well, through the Chicago area. I've driven in almost every state (46) and many of the large cities in the US and Chicago has got to have the worst drivers I've ever encountered. I've driven in Manhattan/Brooklyn, Boston (I hear their motto is "We Eat New York Plates for Breakfast"), Lost Angeles, DC, San Franciso/Oakland, Dallas, Atlanta, New Orleans, Miami, the Twin Cities, Seattle, Cleveland and numerous others and either driven there or rented cars while there. I learned to drive near Boston and then DC.
Chicago drivers go faster in heavy traffic, use turn signals less and do multi-lane changes at high speed differentials with inadequate spacing far more often than in any other place I've been. Coupled with the God-awful traffic around Chicago no matter what time you go through, well, it's just not a pleasant place to drive.
If the drivers in the Chicago area didn't scare the crap out of me, I might have time to admire their skill.
Also, a disproportionate share of the really aggressive drivers seemed to be driving BMWs. A good choice, I suppose, if you're going to drive aggressively. They do handle nicely.
So, does Chicago get the nod for worst drivers or does someone want to nominate someplace else? Please, justify your pick with examples of poor driving practices. I'd like to get beyond the simple "They suck."
If you feel your city's not actually worse, please feel free to nominate a runner-up.
PS: I notice, now, that I've got a typo in "Los Angeles" but it looks somehow appropriate, kind of sums up my experience driving there once, so I'm leaving it.