A comparison study on environmental policies for expressway construction projects between China and the US: A tiered analysis approach.

The development of expressway construction projects (ECPs) poses overwhelming challenges to the physical environment around the world. The challenges are supposed to be addressed with the enforcement of environmental policies (EPs). In this regard, developed countries have gained rich experience in EP formulation while developing countries are making efforts to improve policy decision-making on environmental sustainability. This study compares ECP-related EPs (EREPs) between China and the US by conducting a historical analysis with materials from 1960 to 2018 and text mining-based evaluation with materials from 2009 to 2019. The comparison results indicate that (1) an EREP framework is composed of two systems, namely outer factors and inner EPs; (2) the upper-level EPs exhibit a periodic and plan-dominating trend in China and an explanatory tendency in the US; (3) Chinese EPs are focused on pollution mitigation, whereas US EPs highlight the impacts on human health; (4) Both attach less importance to environmental protection measures at the project-level EPs. This paper provides a longitudinal comparison and analysis of EREPs in two huge countries, implying that EREPs are a snapshot of national rules and backgrounds. The findings lay a foundation for future research to examine the innovation of environmental policies, especially for those countries with massive expressway construction projects and the related environmental issues. • Comparing environmental policies (EPs) for expressway projects in China and the US. • EPs exhibit a periodic trend and are committed to controlling pollution in China. • US EPs shows an explanatory tendency and highlight the impacts on human health. • There is a lack of diversity of environmental protection measures in both countries. [ABSTRACT FROM AUTHOR]