Development of guidelines for triple left and dual right-turn lanes : technical report

One of 88 reports in the series: Technical report (Texas Transportation Institute) available on this site.

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Description

Report regarding the development of geometric and signal design guidelines for triple left-turn lanes and dual right-turn lanes and then evaluatues the safety of such sites in Texas.

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xiv, 1-3, 2-44, 3-16, 4-12, 5-26, 6-11, 7-14, 8-3, A-23, B-8, C-11 : ill. (some col.) ; 28 cm.

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Cooner, Scott A.; Ranft, Stephen E.; Rathod, Yatin K.; Qi, Yi; Yu, Lei; Wang, Yubian et al. July 2011.

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This report is part of the collection entitled: Texas State Publications and was provided by UNT Libraries Government Documents Department to The Portal to Texas History, a digital repository hosted by the UNT Libraries. It has been viewed 351 times , with 17 in the last month . More information about this report can be viewed below.

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  • Texas Transportation Institute
    Publisher Info: Texas Transportation Institute, Texas A & M University System
    Place of Publication: College Station, Texas

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Description

Report regarding the development of geometric and signal design guidelines for triple left-turn lanes and dual right-turn lanes and then evaluatues the safety of such sites in Texas.

Physical Description

xiv, 1-3, 2-44, 3-16, 4-12, 5-26, 6-11, 7-14, 8-3, A-23, B-8, C-11 : ill. (some col.) ; 28 cm.

Notes

"January 2011. Published: July 2011.

Includes bibliographical references.

Abstract - "Left- or right-turn lanes at intersections improve safety and operations by separating turning and through vehicles. At intersections with heavy turning demand, it may be necessary to provide multiple turn lanes. Triple left-turn (TLT) and dual right-turn (DRT) lanes are still considered as relatively new designs that many agencies are reluctant to use, so they are somewhat limited in Texas. Guidelines for TLT or DRT lanes are almost nonexistent, leaving traffic engineers to rely on judgment for their designs. Therefore, their research was needed to develop consistence guidance. The 0-6112 project achieved two primary project goals: (1) development of geometric and signal design guidelines for TLT and DRT lanes; and (2) evaluation of the safety and operational performance of TLT and DRT sites in Texas. Researchers conducted field studies at 5 TLT and 20 DRT, primarily in the Dallas-Fort Worth and Houston urban areas, in order to evaluate lane utilization patterns, saturation flow rates, conflicts, and other operational factors. The research team also analyzed safety performance by investigating the crash history of the 25 sites using three techniques: collision diagrams, field conflict study, and comparison study. The results revealed that TLT lanes do not experience any major safety issues and also concluded that, in general, a well-designed DRT lane does not cause significantly higher crash frequency or severity compared to single right-turn lanes. Based on the results of this research and the geometric and signal design guidelines, Tudor and other agencies should be confident that well-designed TLT and DRT lanes can be implemented to address heavy turning demand at key intersections. The evaluation of these multiple turn lane sites in Texas revealed that they perform well from both operational and safety standpoints. TLT and DRT lanes are not appropriate for all situations, and their use should be supported by an operational analysis. Other techniques (grade separation, signal timing, etc.) might be better solutions for a particular site, especially when considering the effects of adjacent intersections, pedestrian/bicycle movements, and other key factors. Researchers developed a product, Keys to Successful Public Outreach, which is useful for implementing multiple turn lane projects."

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  • July 2011

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  • September 2008 - August 2010

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  • Aug. 12, 2013, 11:05 p.m.

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Cooner, Scott A.; Ranft, Stephen E.; Rathod, Yatin K.; Qi, Yi; Yu, Lei; Wang, Yubian et al. Development of guidelines for triple left and dual right-turn lanes : technical report, report, July 2011; College Station, Texas. (texashistory.unt.edu/ark:/67531/metapth326762/: accessed September 21, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting UNT Libraries Government Documents Department.