I've found that drivers vary tremendously in the US. The best average drivers I've been around were in the California Bay Area. Oregon drivers are generally out of it (left lane freeway camping always started the moment I crossed from CA into OR), and only moderately angry. Arizona had wildly incompetent "snow birds" in the winter and insanely aggressive road raging locals in the summer. I've heard that Boston and New Jersey are like Mad Max with potholes.