Yes, according to that article. What I'm driving at is that making an arbitrary change based on how drivers react to an improper restriction may in fact lead to

Yes, according to that article. What I'm driving at is that making an arbitrary change based on how drivers react to an improper restriction may in fact lead to imposing another improper and arbitrary restriction. A change of 5 mph either way won't change anything fundamental, and so a traffic study will report minimal changes.