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This is complex, isn't it? And "we" could understand it all we want, but that doesn't affect the vast majority of drivers who keep doing the same old thing but expecting a different result.

A couple of things may add to the discussion:

1) I think the gender of drivers has a lot to do with how one drives. I totally understand that women are "safer drivers" than men, for a variety of reasons. But that doesn't mean they don't cause wrecks, just that they don't have as many. Many women appear to not understand the concept of merging AHEAD of the car, at a safe speed just slightly faster than the car they're getting in front of. Instead, I see them decide to change lanes (to make their exit, for example) by coming to a complete and sudden stop, turning on their turn signal, cranking their steering wheel in the direction they want to go, waiting for someone to let them in, backing traffic up severely, in two lanes - the one they're in and the one that slows to let them in. Many times I've seen this result in wrecks several cars behind the lane-changer, of which she is likely totally oblivious. Presumably, many of these women do this every day on their commute, thinking they are safe drivers, when the truth is they are a big part of the problem. I'm quite aware that male drivers do this too, but in my experience women drivers tend to be overly polite (don't even get me started on right of way issues), causing at least as many problems as they think they're solving.

2) I've read all these posts and have yet to see anyone bring up the subject of highway design. Where I live, there are several interchanges where traffic is trying to get onto a major interstate highway at the exact place an equal number of drivers are trying to weave their way across and through the traffic to get off the interstate, and all this is happening in a very short distance. This results in dozens of wrecks each week at this location, not a few involving fatalities. Clearly, these interchanges are poorly designed, though I'm sure the designers would say their design was adequate for the times in which the interchange was built, to which I would reply that increasing traffic flow over time is a durable trend that needs to be planned for.