Abstract Background Tennessee was the least physically active US state in 2011, and among the top 5 most obese states in 2013. To address these issues, the Nashville area Metropolitan Planning Organization (MPO) is integrating health into the transportation planning process and increasing opportunities for active transportation. Our purpose is to describe the policy and research initiatives related to these areas. Methods Regarding policy, the MPO first adopted three policy priorities that Nashville residents identified in a transportation opinion survey: public transit, active transportation, and infrastructure preservation. Next, the MPO devised a transportation project scoring and selection system in which 60% of the criteria quantified how a future roadway project could increase opportunities for active transportation. Additionally, the MPO reserved 15% of its primary allocation from the U.S. Department of Transportation to fund its Active Transportation Program (ATP) for bicycle- and pedestrian-specific infrastructure and programs. Regarding research, the MPO conducted the Middle Tennessee Transportation and Health Study (MTTHS, n=6,000 households, 11,000+ individuals) to measure transportation behaviors and health attributes. Health questions included height, weight, general diet and health quality, and estimated time spent in physical activity and sitting. These data were used to calibrate the Integrated Transport and Health Impact Modeling (ITHIM) tool, which estimates the population health impacts of increased physical activity, reduced air pollution, and altered collision patterns. Results The policy changes in the MPO’s 2035 Regional Transportation Plan resulted in almost 70% of roadway projects including active transportation elements such as sidewalks and bikeways. In the previous 2030 plan, approximately 2% of roadway projects included these elements. Beyond roadway projects, the newly-funded ATP has awarded $13.6 million for active transportation infrastructure and education projects. The research conducted during the MTTHS yielded significant data about the transportation and health attributes of households throughout the MPO region. The data were used to create a Geographic Information System map of high health impact areas of the region, which are defined as areas with high prevalence of reported chronic diseases, low overall health quality, and low physical activity. The map enables the MPO staff to prioritize transportation projects in areas with potential positive health benefits. Finally, initial ITHIM modeling suggests that changes in physical activity, air-quality, and collisions may contribute to reduced mortality and morbidity in the region. Conclusions The Nashville Area MPO has made significant progress in integrating health into the transportation planning process by changing policy and allocating funding for active transportation research and modeling.
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