@hx @dmoser @failedLyndonLaRouchite I don't like unsourced posts either. And the way at first glance the graphic looks like a recent finding from TUMI. My library only has the book in print and I'm not there rn, but I'm pretty sure the research it presents is the same as in this paper: Donald Appleyard & Mark Lintell (1972) The Environmental Quality of City Streets: The Residents' Viewpoint, Journal of the American Institute of Planners, 38:2, 84-101, DOI: 10.1080/01944367208977410