The Regional Plan Association, the New York-region planning think tank, has produced a great new map as part of their Fragile Success report:
This map takes the travel time methodology regular readers of this blog know well, but then within that area of access shows all of the jobs, categorized by sector, as a dot density map. The effect is to visualize the quantity and number of jobs that can be reached from a give point in a given time, by walking, transit, cycling, or driving. The map is also able to quickly calculate the number of jobs inside the AM peak travelshed on the fly, and even allows the user to toggle on and off different job classifications. If you want to see all of the education jobs within a 30 minute walk of a given location, now you can.
To revisit a 2012 post, this sort of map of personal mobility is useful for two reasons:
Helping people and organizations understand the transit consequences of where they choose to locate, and thus to take more responsbility for those consequences. This, over time, can help people who value good transit to locate where transit access is good -- something that's very hard to discern from a typical bus map but that becomes very obvious here. You can even assess access to specific things that you value, based on exactly where the blobs are.
Helping people visualise the benefit of transit -- access to your city -- as a freedom, and thus to understand more clearly what transit does for them. It broadens the narrow notion of travel time -- which is often understood for only one typical trip -- into a picture of your options for accessing all the things you value. The percentage of a city's resources (jobs, housing, retail etc) that is in the blobs for a particular location could also form the basis for a meaningful Transit Score that could replace the technologically biased scores now used by WalkScore.com.