Road design in towns and cities is probably the biggest example of the POSIWID principle that people interact with daily. In some cases, we know from historical record that the disruption created to communities was actually intentional (highways in many major cities were built through minority communities because they were less politically distasteful to displace or destroy). But even when it wasn't, many American cities have been carved up by arterial roads that have converted livable areas to ghost towns; when a highway cuts you off from the grocery store, you suddenly need a car to buy food where you didn't before, and that forces people from their homes.

Now that we recognize these effects, we can start addressing them.