I stop at red lights relgiously, but at stop signs, usually I filter towards the front, and manage my speed so that I take off a the same time as a car, using the car as a shield. If there are no cars, I slow down probably not enough. If I am alone in my direction, and there are cars coming from other directions, I try to be conservative, slow, wag my head to tell cars to head through. But I never generally come to a full stop, I get down to maybe a 1-2mph almost track-stand, but try not to unclip.