The document discusses a potential mobile phone navigation application that could be used in Aizuwakamatsu, Japan to address transportation issues in the city. It proposes an app that would suggest the most optimal routes for users to reach their destinations via walking, vehicles, or trains using GPS. This would help reduce traffic congestion in the city, benefiting both citizens and tourists. The document then outlines how such an application could be tested for usability with citizens of Aizuwakamatsu.