Detroit Traffic Survey Map 1936-1937

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Detroit Traffic Survey 1936-1937: Mass Transportation Passenger Flow During General Traffic Peak Hours, 5pm to 6pm

Thanks to redditor DetroitStalker for posting this great map!

This map uses a very innovative visualization method with the increasingly wide or narrow pathways of traffic. The method has become popular again with transit planners (see GraphServer). This map is pre-expressways, so you can see the importance of Detroit spoke streets and public transit system. Great use of data visualization in the 1930s to understand traffic flows on the street railways.

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