The Diminishing Returns of Highway Building

Today on the Streetsblog Network, David Levinson at the Transportationist presents some interesting explanations about why so much American road building is a poor use of funds:
In this image, the black lines represent roads and the blue dotted line represents a traveler. At some point, adding additional roads is subject to diminishing returns, saving people less time [...]

Source: http://streetsblog.net/2013/01/10/the-diminishing-returns-of-highway-building/

Brian Gubby André Guelfi Miguel Ángel Guerra Roberto Guerrero