What if you phrased it differently: “the roads were designed under different assumptions”?<p>In the past it was often assumed that most people would stay on major roads because only locals memorized chains of streets and even the people who planned routes (Thomas Brothers maps were a hallmark of the SoCal commuter, after all) would chain a few routes together but generally still kept it to what a human could remember since you couldn&#x27;t safely read a map while driving.<p>Now that that has completely changed, it&#x27;s probably true to say that the majority of local roads and traffic flows need to be reconsidered to see whether the signage or structure should change to enforce the way it was previously assumed they&#x27;d be used.