Plans for post-investment road ERR evaluations should be subjected to a formal review process that requires (among others) substantive review and clearance by sector specialists of key evaluation documents to provide feedback on the technical and factual accuracy of evaluation plans. This approach should ensure that the selection of the Highway Development and Management (HDM-4) vs. RED models to estimate the long-term costs and benefits of the road investments is appropriate to the characteristics of the road to be evaluated.
Lesson Learned