Design Guidance for High-Speed to Low-Speed Transition Zones for Rural Highways

This report presents guidance for designing the transition from a high-speed rural highway to a lower-speed section, typically approaching a small town. The report includes a methodology for assessing these highway sections and a catalog of potential treatments for addressing problems. It will be useful to geometric designers and traffic engineers responsible for these situations. The TRB website includes two significant products derived from this project. The first is a spreadsheet that can be used to create a straight-line diagram of a site that brings together all of the relevant information for analysis. The second is a Design Guidance document that a transportation agency can adapt to meet its own purposes and needs.