- Request Literature Searches and Literature Reviews from the Library
- The CDOT Library provides consultations, and resources for developing literature searches and literature reviews. We will work closely with researchers to define and refine a topic scope. Researchers then have a number of options. They can choose a basic Literature Search from the CDOT Library or request an extensive Literature Search or a Literature Review. Contact the CDOT Library or request a Literature Search/Review by completing this form. For examples of previous Literature Searches/Reviews visit the Lit Search/Review LibGuide.
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Swedish 2+1 Cable Rail - Road Safety Improvements
- CDOT maximizes accident reduction within the limitations of available budgets by making road safety improvements at locations where it is most productive. The deployment of a 2+1 Road with Barrier in Colorado has the potential to improve road safety. Rural 2-lane highway crashes tend to be of higher severity than other highway types due to a combination of high speeds, designs with narrower shoulder widths, limited clear zone, curvature, and separation of opposite flows of traffic, and a broader mix of users and uses than rural freeways. This proposed Colorado Design of cable-separated two-lane roads with a truck-passing lane is adapted from a Swedish design that has been widely implemented and has a record of success. The research from the study is proposing a slightly different design with some modifications recommended to better reflect United States driver expectations. Compared to the European design, it would not only prevent head-on crashes from the opposite side of the highway but also slow people down. Ontario, Canada has moved ahead with the first North American Implementation of a similar design. The full research report is available at (CDOT Report 2020-05) Evaluation of the Feasibility of Deployment of Swedish 2+1 Road with Barrier in Colorado. To learn more contact David Reeves.
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Development of Environmental Product Declarations (EPDs) for Sustainable Pavement Procurement
- EPDs are the future of construction material requirements in transportation and CDOT is developing EPD protocols that are uniquely suited to the state. Colorado House Bill 21‐1303, signed on July 6, 2021, requires CDOT to establish policies regarding the global warming potential for asphalt and asphalt mixtures, cement and concrete mixtures, and steel used in a public road, highway, and bridge projects by 2025. The bill calls on CDOT to use nationally or internationally recognized databases of EPDs, and for CDOT to require contractors to submit a current EPD, Type III, as defined by ISO Standard 14025, for construction materials when bidding on publicly funded projects.
The objectives of this study were to assess the current state‐of‐practice of EPDs in pavement material manufacturing; to educate stakeholders regarding pavement life cycle assessment (LCA) and EPDs, and to develop protocols CDOT and pavement material producers can use to integrate EPDs that are uniquely suited to Colorado. The full research report is available at Development of Environmental Product Declarations (EPDs) for Sustainable Pavement Procurement. To learn more contact Thien Tran.
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