Study Finds Livable Streets Even More Important for Kids than Adults
Fewer cars means more walking and healthier kids. By most measures, San Francisco is a great place to walk and bike, with its compact street grid, mixed-use neighborhoods and relatively mild weather. But a new study conducted by UC Berkeley professor Michael Jerrett suggests the city may need to focus on taming traffic before kids will get the full health benefits of that dense development.
Streetsblog New York's Noah Kazis reports on the study, which links traffic volumes to youth obesity:
Jerrett shows that not only does the built environment matter, but traffic volumes matter too. His team's long-term study tracked children from across Southern California, starting from ages 9-10 and continuing through high school. Controlling for a wide variety of factors, they compared the children's body mass indexes (BMI) to the density of traffic near their homes.Children living within 150 meters of high-traffic areas were found to have, on average, BMIs five percent higher than those living near low-traffic areas. Only the immediate surroundings seem to matter: Traffic levels within 300 or 500 meters didn't affect BMI.
The researchers put forward two reasons for why traffic volumes contribute to obesity. High asthma rates could be part of the equation, making kids less likely to engage in physical activity. Kids - and their parents - also seem to be especially sensitive to the real or perceived danger from cars, much more so than adults.
To put the findings in context, a regular San Francisco block is about 600 feet, or about 180 meters. If kids live on a street with a lot of traffic, or if the next cross street is overrun with cars, there's a real chance they'll be less likely to bike or walk.
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