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Air Quality, Safety, and Well-Being Consequences of Transportation Impacts

When millions reduced their travel, local air quality improved and the rate and severity of traffic crashes decreased. But what were the impacts on individual mental health? And what can we learn about the personal psychological utility of travel by understanding the stressors imposed on those without access to a personal vehicle? Also, how are these observed travel changes impacting our understanding of transportation systems, which are derived from modeling and forecasting?