Donald Appleyard (1928–1982) was a Professor of Urban Design at the University of California, Berkeley. In his book Livable Streets, he showed that streets have many social and recreational functions which are severely impaired by fast car traffic. For example, residents of streets with light traffic had, on average, three more friends and twice as many acquaintances as the people on streets with heavy traffic. His work provides a quantitative rationale for traffic calming and living streets.
Ironically, Appleyard was killed by a speeding automobile.
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