Additional years of data can be found in the Excel download.
Note: Error bars are used to indicate the error, or uncertainty, in a reported measurement.
Why is this important?
Active transportation, including walking and bicycling, can help meet human health goals, such as reducing rates of obesity, while also decreasing greenhouse gas emissions.[i] Commuters able to walk or bicycle benefit from an increase in physical activity, and users of all alternative transportation types—walking, bicycling, carpooling, and public transit—benefit from a decrease in transportation costs. Even those not able to take alternative transportation still benefit from its use, since having fewer cars on the road decreases emissions and traffic congestion.
[i]L. Frank, M. Greenwald, S. Winhelman, J. Chapman, and S. Kavage, 2010. "Carbonless Footprint: Promoting Health and Climate Stabilization through Active Transportation," Preventive Medicine 50 (2010): S99-S105.
N. Gallagher, A. Kimberlee, J. Gretebeck, J. Robinson, E. Torres, S. Murphy, and K. Marty, "Neighborhood Factors Relevant for Walking in Older, Urban, African American Adults," Journal of Aging and Physical Activity 18 (2010): 99-115.