I just read a 2018 book by a variety of authors (most notably Jonathan Levine, author of Zoned Out), From Mobility to Accessibility: Transforming Urban Transportation and Land Use Planning.

The key point of the book is that rather than focusing solely on “mobility”, planners should focus on “accessibility”. What’s the difference? The authors describe Mobility as speed or the absence of congestion; thus, a new highway that saves suburban commuters a few seconds increases mobility. “Accessibility” means making it easy for people to reach as many major destinations as possible, regardless of the mode of transport.

For example, allowing more housing near downtowns and other urban Job Centers increases accessibility because it makes it easier for more people to live near work. However, residents of these neighborhoods might oppose such housing based on concerns about mobility; that is, they might fear that new neighbors might reduce mobility by increasing traffic.

Obviously, an emphasis on increasing accessibility favors more compact development: people benefit from living closer to work, even if they are not driving 80 miles an hour. It also seems to me that the emphasis on accessibility favors more market-oriented land use policies; in the absence of government control, landowners will naturally want to increase accessibility by building housing near job centers and vice versa.

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