This sort of reasoning is faulty, common, and quite irritating. The maximum safe speed includes all necessary safety margins, which have already been incorpora

This sort of reasoning is faulty, common, and quite irritating. The maximum safe speed includes all necessary safety margins, which have already been incorporated by engineering. The maximum safe speed varies according to conditions, of course, but it is the actual maximum safe speed. By definition you can drive at maximum safe speed all day long with only the usually accepted risk of vehicular travel.