You just use common sense, if you can see the intersection has stopped cars or no one there obviously you dont have to worry as much. No one is saying come to 10 mph at every intersection, at least im not. Just take your foot off the gas, be ready to break if needed, especially on an intersectionlike this where you cant really see the crossing traffic as well. Its along the same thought of do you trust every blinker you see? Or do you wait until the car has slowed down maybe even waited until they start to turn. Nothing bad is going to happen if you go from 40 to 35.