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Lesson Learned

The decision of when and what data should be collected should be driven by the logic of the investment and a good critical sense of how to gather information cost-effectively.

The decision of when and what data should be collected should be driven by the logic of the investment and a good critical sense of how to gather information cost-effectively. Some markets may respond gradually to improved road conditions, therefore, using traffic counts collected less than two years after road completion may not allow sufficient time to detect important effects of road improvements. As MCC designs transportation projects and their evaluations, outcome measures should be carefully chosen to cost-effectively and credibly assess the stated economic justification of road investments.