求翻译：The final transportation system participant, the public, is concerned with transportation accessibility, expense, and effectiveness as well as environmental and safety standards. The public indirectly creates transportation demand by purchasing goods. While minimizing transportation cost is important to consumers, concerns also involve environmental impact and safety. The effect of air pollution and oil spillage is a significant transportation-related social issue. The cost of environmental impact and safety is ultimately paid by consumers.是什么意思？

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