Evaluation of Triangabout as Alternative for Intersection with Nonthrough Arterial Movement
At the majority of signalized intersections along an arterial, the mainline movement passes straight through the intersection. At four-leg intersections where the major arterial movement is not a through movement (i.e., an L-shaped corridor vertex), the intersection can sometimes experience more congestion than adjacent intersections along the corridor because the two minor approaches, which are adjacent conflicting movements, must be served in a split-phase fashion. A new, unconventional intersection design, referred to as a "triangabout," is proposed to improve mobility and enhance safety for such intersections. The two approaches that are the mainline arterial form two legs of a triangle and a new diagonal section of roadway connecting those two legs is the hypotenuse. Flow within the triangabout is one-way counterclockwise, similar to a roundabout. The three intersections at the vertices of the triangle are signalized to provide a dedicated right-of-way. A case study is performed for the intersection of Van Voorhis Road and Chestnut Ridge Road in Morgantown, West Virginia, along the WV-705 corridor. Simulation results from VISSIM show that the triangabout design can reduce travel delay by 50% compared with the existing configuration. Also, the number of conflict points compared with a conventional intersection is reduced by 34%. There are a number of qualitative benefits of this design compared with conventional intersections at an L-shaped corridor vertex.
- Record URL:
- Summary URL:
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Availability:
- Find a library where document is available. Order URL: http://www.trb.org/Main/Blurbs/171086.aspx
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Authors:
- Chou, Chih-Sheng
- Nichols, Andrew P
- Publication Date: 2014
Language
- English
Media Info
- Media Type: Print
- Features: Figures; Photos; References; Tables;
- Pagination: pp 38–48
- Monograph Title: Operational Effects of Geometrics and Access Management 2014
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Serial:
- Transportation Research Record: Journal of the Transportation Research Board
- Issue Number: 2404
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Arterial highways; Geometric design; Highway safety; Mobility; Roundabouts; Signalized intersections; Traffic congestion; Triangles
- Geographic Terms: Morgantown (West Virginia)
- Subject Areas: Design; Highways; Operations and Traffic Management; I73: Traffic Control;
Filing Info
- Accession Number: 01515576
- Record Type: Publication
- ISBN: 9780309294973
- Report/Paper Numbers: 14-5160
- Files: TRIS, TRB, ATRI
- Created Date: Feb 24 2014 8:43AM