I never underestimate the timidity and lack of discernment by Iowa drivers.
P.S. I'm from Chicago, so that may be a factor in my perspective.
Perspective can be a funny thing. I wouldn't consider aggressive, bumper riding, lane jumping (typical per my experiences in the Chicago area) "good" driving practices if that's what you're implying? Or that following at a safe distance is passive or a lack of judgement...