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Environmental reviews, citizen concerns have driven up highway construction costs

In the draft of Brooks’ and Liscow’s study, the two also point to higher-income communities or coalitions that demand more expensive highways as a reason for rising costs. This is because, according to the researchers, demand for many goods increases with income or wealth. Also, individuals or groups with more money are likely to have more of a voice in the process that decides the kind of highway systems that get built.

Other potential reasons cited in the study for the rising cost of highways are:

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