Your analysis is fine but there are plenty of cases when Pedestrians should not be factored and still the speed limit is too low. We are talking about one way h

Your analysis is fine but there are plenty of cases when Pedestrians should not be factored and still the speed limit is too low. We are talking about one way highway traffic where no pedestrian can enter (or at least should not enter), where opposing traffic risk is Zero (one way), visibility very good etc. there are plenty of examples like this one where you really have to try hard to stay in the speed limit. and cases like this just make it hard to respect the speed limits even when they should be respected because they teaching us that the speed limits are arbitrary and we human beings do not like arbitrary things.