I base it on the situation. If it's low traffic and everyone is just coming to a stop so they will be stopped as I pass by, I go ahead. If they might start moving when I'm riding up to them, I might stay in line or go around depending on how much room I have. I'll admit I've done some pretty stupid stuff when it comes to traffic riding since I live in a pretty urban/congested area, but I try to be as safe as I can in most cases. I also have a bad habit of running lights that are semi-small or pretty un-congested. I also rarely stop at stop signs unless I see a car approaching that likely will pull out in front of me or I can't see if there is a car coming up to the sign.
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