In the decades immediately after World War II, increased mobility was driving economic growth. Whether it was families living in new housing in the suburbs, the ability of employees to switch jobs more easily, or the capacity for farmers, loggers, and miners to get their materials to distant markets, the fact that Americans could reach more places in less time provided accelerating levels of prosperity. This notion became a self-evident truth embedded within the traffic engineering profession. Out of it sprung many beliefs that are now orthodoxy.
