Development of Guidelines for Ramp Reversal Projects

This project summary report summarizes the research performed in Texas Department of Transportation (TxDOT) Project 0-5105. TxDOT has implemented freeway system improvements in order to reduce congestion and improve safety. Such improvements include new ramps, grade-separated ramps, frontage road U-turn lanes, ramp relocations, and ramp reversals (replacement of an entrance ramp with an exit ramp or vice versa). Because of funding and personnel constraints, the various improvement strategies need to be easily prioritized according to their expected cost-effectiveness. Researchers on this two-year project conducted a literature search, a survey of TxDOT personnel, and case-study evaluations. The research team then developed a project evaluation process and framework to serve as a high-level guide for determining whether or not a ramp reversal, X-ramp, or braided ramp project is worthwhile to implement. Finally, researchers formulated guidelines and a checklist to further assist TxDOT engineers in planning and implementation of successful ramp modification projects. Overall, the operational, safety, and basic economic impacts of ramp modification projects are primarily positive in nature. The detailed case study evaluation data and anecdotal information from stakeholders of previously implemented projects support further implementation of both ramp reversal and X-ramp corridor projects by TxDOT.