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- 2004438232 abstract "It is generally accepted that the level of service (LOS) at intersections significantly affects the overall LOS of the road system. It is also known that the LOS at an intersection can be adversely affected by frequently allowing left-turning vehicles to block through traffic. In addition, crash rates tend to be higher at intersections than on through sections of a road. The separation of left-turning vehicles from through traffic is therefore an important condition for the safe and effective operation of intersections. Existing guidelines for installing left-turn lanes have several limitations. They are mainly based on the traffic volumes at the intersection, and they use deterministic models with fixed gap acceptance and/or left-turn maneuver times. In addition, the guidelines for left-turn lanes for unsignalized intersections and signalized intersections must be specific for the type of intersection. In this study, new left-turn guidelines for both unsignalized and signalized intersections were developed on the basis of well-validated event-based simulation programs. Guidelines for unsignalized intersections were based on the percentage of left turns blocking through vehicles, whereas the guidelines for signalized intersections were developed using a minimum left-turn volume of either 85% left-turn capacity or LOS E delay (55 seconds/vehicle). In addition to the general guidelines, a prioritization tool that can be used to prioritize candidate intersections was developed. The prioritization tool accounts for both operational and safety aspects.".
- 2004438232 contributor B10023818.
- 2004438232 contributor B10023819.
- 2004438232 created "2004.".
- 2004438232 date "2004".
- 2004438232 date "2004.".
- 2004438232 dateCopyrighted "2004.".
- 2004438232 description "Final report; September 2001-December 2003.".
- 2004438232 description "Includes bibliographical references (p. 46-47).".
- 2004438232 description "It is generally accepted that the level of service (LOS) at intersections significantly affects the overall LOS of the road system. It is also known that the LOS at an intersection can be adversely affected by frequently allowing left-turning vehicles to block through traffic. In addition, crash rates tend to be higher at intersections than on through sections of a road. The separation of left-turning vehicles from through traffic is therefore an important condition for the safe and effective operation of intersections. Existing guidelines for installing left-turn lanes have several limitations. They are mainly based on the traffic volumes at the intersection, and they use deterministic models with fixed gap acceptance and/or left-turn maneuver times. In addition, the guidelines for left-turn lanes for unsignalized intersections and signalized intersections must be specific for the type of intersection. In this study, new left-turn guidelines for both unsignalized and signalized intersections were developed on the basis of well-validated event-based simulation programs. Guidelines for unsignalized intersections were based on the percentage of left turns blocking through vehicles, whereas the guidelines for signalized intersections were developed using a minimum left-turn volume of either 85% left-turn capacity or LOS E delay (55 seconds/vehicle). In addition to the general guidelines, a prioritization tool that can be used to prioritize candidate intersections was developed. The prioritization tool accounts for both operational and safety aspects.".
- 2004438232 description "Performed by Virginia Transportation Research Council for Virginia Department of Transportation and U.S. Federal Highway Administration under contract no. 60597".
- 2004438232 extent "iii, 69 p. :".
- 2004438232 hasFormat "Also available online (Adobe Acrobat Reader required) via the Virginia Transportation Research Council website http://www.virginiadot.org/vtrc/main/index%5Fmain.htm.".
- 2004438232 identifier 04-r11.pdf.
- 2004438232 isFormatOf "Also available online (Adobe Acrobat Reader required) via the Virginia Transportation Research Council website http://www.virginiadot.org/vtrc/main/index%5Fmain.htm.".
- 2004438232 isPartOf "VTRC (Series) ; 04-R11.".
- 2004438232 isPartOf "VTRC ; 04-R11".
- 2004438232 issued "2004".
- 2004438232 issued "2004.".
- 2004438232 language "eng".
- 2004438232 publisher "Charlottesville, Va. : Virginia Transportation Research Council,".
- 2004438232 relation "Also available online (Adobe Acrobat Reader required) via the Virginia Transportation Research Council website http://www.virginiadot.org/vtrc/main/index%5Fmain.htm.".
- 2004438232 subject "388.1/3 22".
- 2004438232 subject "HE336.L43 D48 2004".
- 2004438232 subject "Left-turn lanes.".
- 2004438232 subject "Roads Interchanges and intersections.".
- 2004438232 subject "Traffic flow.".
- 2004438232 subject "level of service. trt".
- 2004438232 subject "signalized intersections. trt".
- 2004438232 subject "unsignalized intersections. trt".
- 2004438232 title "Development of left-turn lane guidelines for signalized and unsignalized intersections / Vijayendra R. Lakkundi ... [et al.].".
- 2004438232 type "text".