问答题 Excessive dependence on automobiles has profound negative impacts on human health: decreased opportunities for physical activity, increased exposure to air pollution, raised vulnerability to chronic diseases and the mounting incidence of traffic crashes that alone cost a staggering $180 billion. The determination of the magnitude of the health impact is notoriously so tricky as to end up with an astronomical figure probably. No calculation can be complete without formulating practical standards or models for estimating health costs. Costs associated with obesity, breathing illness, and injuries are evidenced by research. Growing recognition of the close connection between transportation, social cohesion and health has resulted in some studies that have achieved compelling findings.