Analysis Results. With the assembly of data as described above, NAMPO calibrated the ITHIM model for the MPO region. Results of the model runs for the baseline and the four analysis scenarios are shown in Table 13. Walk 0.7 1.7 3.7 5.7 1.7 Bike 0.3 1.0 1.5 3.0 1.3 Vehicles 195.9 194.2 191.6 188.1 175.1 Driver 151.8 150.5 148.5 145.8 142.9 Passenger 44.1 43.7 43.1 42.3 32.2 Total1 225.0 225.0 225.0 225.0 206.2 Walk 18.4 37.8 82.2 126.7 37.8 Bike 2.6 8.0 12.0 24.0 10.4 Vehicles 418.1 414.6 409.2 401.7 373.7 Driver 324.0 321.3 317.1 311.3 305.1 Passenger 94.1 93.3 92.1 90.4 68.6 Total2 494.5 515.7 558.8 607.8 477.3 Chronic Diseases 1,124 2,793 4,375 1212 Injuries / Fatalities −552 −1,240 −1,733 1 Net Change 572 1,552 2,642 1213 Chronic Diseases 38 109 165 41 Injuries / Fatalities −14 −31 −43 −2 Net Change 24 71 123 39 Economic Cost Savings (Millions) $10 $32 $63 $46 For the conservative scenario, ITHIM predicted 38 deaths avoided due to reduction in chronic disease incidence (1.1% reduction in diabetes and 1.0% in cardiovascular disease) (▇▇▇▇▇▇▇▇▇ et al., 2017). However, 14 additional traffic fatalities incurred as a result of increasing walking and bicycling, resulting in a net 24 deaths averted per year for the conservative scenario. The estimation of ▇▇▇▇▇ shows a net improvement of 572 averted DALYs. After multiplying the chronic disease and injuries/fatalities estimates with the economic cost estimates (see Table 12), approximately $10 million was predicted to be saved through decreased direct healthcare expenses and indirect productivity losses. ▇▇▇▇▇▇▇▇▇ et al. (2017) noted that ITHIM results in all analysis scenarios revealed that the economic benefits of increasing active transportation attained through increased physical activity were significantly greater than the benefits attained from reduced air pollution. Under the moderate scenario, the predicted benefits also outweighed the predicted ▇▇▇▇▇ with net reduction of 71 deaths and 1552 ▇▇▇▇▇ avoided per year (see Table 13). The cost estimates for the moderate scenario suggested a saving of $32 million in direct and indirect costs. The aggressive scenario resulted in a net decrease of 123 deaths and 2,642 averted DALYs per year. The economic cost savings of the aggressive scenario was estimated to be $63 million in direct and indirect costs. For the injury-neutral scenario, after an increase in both walking and bicycling of 1.0 mile per person per week, the analysis suggested that an 11% decrease in vehicle miles per person per week (175.1 versus 195.9 miles per week, Table 4) would offset the DALYs incurred by increased pedestrian and bicyclist injuries and fatalities. With this amount of reduction in vehicle miles, the analysis suggested that 1,212 DALYs could be avoided due by reducing chronic disease incidence and 1 ▇▇▇▇ could be averted due to reduced injuries and fatalities. The estimated economic cost savings for this scenario was approximately $46 million. ITHIM implementation in Nashville was one of several steps that NAMPO had taken to improve public health through transportation planning. NAMPO's decision in running ITHIM was to quantify and present the health benefits of active transportation to the stakeholders and the general public. ▇▇▇▇▇▇▇▇▇ et al. (2017) noted that ITHIM outputs were well-received and the results were included in the NAMPO 2040 Regional Transportation Plan. As a result, sidewalk mileage in NAMPO region increased by 57 percent, bikeway mileage by 19 percent, and greenway mileage by 36 percent between 2009 and 2014 (NCHRP, 2019).
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Sources: Technical Memorandum, Technical Memorandum