From a public perspective, infrastructure investments are made to serve societal needs and thus the true measure of efficacy becomes their net effect on the Triple Bottom Line (TBL) of economy, environment and society. The perspective lent by the recently published NCHRP Report 750 Volume 4: Strategic Issues Facing Transportation, Volume 4: Sustainability as an Organizing Principle for Transportation Agencies "Maturity Model" provides a useful platform for assessing sustainability rating tools in this light. This paper reviews existing and emerging sustainability analysis methods using this construct and demonstrates how a unifying approach using dollar equivalents can be of particular utility in making a business case for societal investment.
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