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The chapter investigates EU member states΄ appraisal of indirect effects of transport investment. Indirect effects can be determining factors in cost–benefit analysis. They are particularly interesting because they are caused by investment-induced changes in market imperfections and national borders. Increasing mobility and decreasing returns to infrastructure networks urge for integrated appraisal of transport initiatives. Harmonisation could lead to greater transparency and improved investment decisions. National evaluation methods, however, differ widely in their assessments of indirect effects. [ABSTRACT FROM AUTHOR]