Yeah, except those kind of things (rolling a stop sign) are pretty obvious to explain (impatience). In the example I gave, people are actually making their commute a few minutes longer, just so...they don't have to zipper merge (?). Anyway, I notice all sorts of things in other drivers that I don't like but can easily understand the reasoning behind (selfish as it may be). But this isn't one of them. Another mysterious one is the people that leave a school bus length between them and the car in front of them (or the stop line) at red lights. I can understand leaving maybe a 0.5-1 car lengths (at max) to have a buffer zone in case you get rear-ended, but ginormous gaps make no sense. And sometimes these people will slowly crawl forward the whole time until they're at a more "normal" distance, which would definitely negate the whole "it's for safety" reasoning for those folks.