Project teams must ensure complete and high quality data is collected both for the Highway Development and Management (HDM-4)/Roads Economic Decision (RED) ERR modeling purposes that feed into project selection and design, and for M&E purposes during and after implementation. The HDM-4/RED models should be based on fully developed feasibility studies that provide accurate cost and time estimates and other reliable technical inputs. They must also be well developed and calibrated at the feasibility study stage and continue to be updated as costs and other design parameters change throughout the construction stages and post-project completion.
Lesson Learned