http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Design and operation of U-turns at diamond interchanges in Texas
Guidelines for design and operation of U-turns
Research and Technology Implementation Office,
1 online resource (xix, 288 pages) : color illustrations, color maps
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.
by Jonathan Tydlacka, P.E., Tracy Zhou, Ph.D., Karen Dixon, Ph.D., P.E., Raul Avelar, Ph.D., P.E., Liang Ding, P.E., Steven Venglar, P.E., Nadeem Chaudhary, Ph.D., P.E. and Marcus Brewer, P.E.
"Report Number FFHWA/TX-17/0-6894-1"--Technical report documentation page.
Technical report; September 2015--August 2017.
Performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration 0-6894
Includes bibliographical references (pages 133-134).
Research report (Austin, Tex.) ; 0-6894-1