I usually try to "let people in" line because I guess in a wierd sort of way I hope ppl will let me in sometimes. Things are kinda different in the area where I live. There are very few "lines of cars". Ya'll have to keep in mind too that the roads are only going to get more and more crowded over the coming years especially in metro areas - Atlanta, Ga. and LA, Calif. comes to mind. Twenty years from now that may be the only way you will be able to get in line. It does not matter what I, nor the person I am "letting in" drive I still let em in.
I think alot of this mentality comes from having spent hours and hours on a road bicycle covering hundreds of miles.

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Jim