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Design and Operation of U-Turns at Diamond Interchanges in Texas
| 题名： | Design and Operation of U-Turns at Diamond Interchanges in Texas |
| 作者： | Tydlacka, J.; Zhou, T.; Dixon, K.; Avelar, R.; Ding, L.; Venglar, S.; Chaudhary, N.; Brewer, M. |
| 关键词： | Turnabout lane##signal operations##U-turn##Frontage road##Diamond interchange##Ramp terminals##Interchange safety##Intersection countermeasures##Implementation##Guidelines##Management##Safety performance##Texas Department of Transportation (TxDOT)##Roadway Design Manual## |
| 摘要： | U-turn lanes are commonly provided at diamond interchanges to reduce delays for U-turning traffic and for the interchange as a whole; however, there are currently many unknowns related to their design, operation, and use. This project provides the Texas Department of Transportation (TxDOT) with implementable guidelines for designing and operating U-turn lanes at diamond interchanges. Researchers identified and investigated several factors affecting U-turn lane use, determined the performance and limitations of U-turn lanes under various geometric and operational conditions, and determined the anticipated effectiveness of proposed solutions to U-turn operational issues. Researchers then developed and structured guidelines for inclusion in the TxDOT Roadway Design Manual and other manuals addressing access management, design, and operations of U-turn facilities. This investigative effort included a cross-sectional safety analysis of existing U-turn configurations that provided valuable insight into factors contributing to U-turn safety. Along with the safety analysis, researchers developed a self-calculating spreadsheet tool that can be used to predict U-turn safety performance under various conditions. |
| 总页数： | 310 |
| 报告类型： | 科技报告 |
相关文献
- Geometric Design and the Effects on Traffic Operations, 2005.
- Geometric Design and the Effects on Traffic Operations, 2005. Transportation research record.
- Guidelines for Design and Operation of U-Turns, Project Summary
- Operational Evaluation of Right Turns Followed by U-Turns at Signalized Intersections (6 or More Lanes) as an Alternative to Direct Left Turns.
- Operational Evaluation of Right Turns Followed by U-Turns (4-Lane Arterials) as an Alternative to Direct Left Turns.
- Safety Evaluation of Right Turns Followed by U-Turns at Signalized Intersection (6 or More Lane Arterials) as an Alternative to Direct Left Turns, Conflict Analysis.
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