Informing Roadway Sustainability Practices by Using Greenroads Certified Project Data

The rapid growth in popularity of sustainable roadway certification systems suggests that a holistic evaluation of rating systems and a retrospective examination of sustainable roadway practices are warranted. Regardless of underlying sustainability definitions guiding any transportation project rating system, literature reveals that there is little consensus on how rating systems should ultimately weigh human, environmental, and economic needs relative to each other. This research is the first effort to use documented project certification data, a unique data set consisting of 28 Greenroads certified projects, to investigate the state of practice of sustainability rating systems and sustainable construction practices. By using quantitative and qualitative analyses, this study identifies and explores common strategies used by project teams to achieve sustainability under the Greenroads rating system. This study argues that sustainable projects make a quantifiable difference in performance compared with ty...