I was down in Plano, TX for a few months...ugh, I hate the traffic system done there. Everything is 6 lanes or wider and the intersections are enormous. I found making left-hand turns less than intuitive. USUALLY, at least here in PA, when you are in a turning lane and the signal is a green arrow, you can turn right away, but I found in Plano that opposing traffic doesn't necessarily have a red light and they will come towards you.
It's funny that two of the worst intersections are about 10 miles from my house on the Roosevelt Boulevard (US 1). Again, the Boulevard is a 12 lane road (widest non-interstate, non-limited access road I know) and the intersections are very large. I still find driving on US 1 a lot easier than driving in the Dallas suburbs, though.