Signal Timing for Diverging Diamond Interchanges: Fundamentals, Concepts, and Recommended Applications
A diverging diamond interchange (DDI) is an innovative interchange design that is being used with increasing frequency in the United States because of the ability to use existing right-of-way and infrastructure frequently. This paper documents the state of the practice in DDI signal phasing with pri...
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Published in | Transportation research record Vol. 2557; no. 1; pp. 1 - 10 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Los Angeles, CA
SAGE Publications
2016
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Online Access | Get full text |
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Abstract | A diverging diamond interchange (DDI) is an innovative interchange design that is being used with increasing frequency in the United States because of the ability to use existing right-of-way and infrastructure frequently. This paper documents the state of the practice in DDI signal phasing with principles established in the Signal Timing Manual, namely, that it uses consistent phase numbering in a logical format to describe each of the phasing concepts being considered and discussed in this paper. Although some literature exists on several methods of signal phasing for DDIs, inconsistency in the reporting leaves practitioners scratching their heads when attempting to decipher what phasing scheme to use. In response, three fundamental phasing schemes are presented, one each for volume patterns with two, three, and four critical movements. Each scheme is described with a consistent naming convention, and, when possible, each is manipulated to provide varying coordination strategies. In addition, concepts such as use of actuation and barriers to improve coordination are described, and methods for reducing lost time are introduced. Other supplemental information related to preemption and pedestrians is discussed briefly. In conclusion, practitioners are given some basic guidance on when one phasing scheme may be more appropriate than another. |
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AbstractList | A diverging diamond interchange (DDI) is an innovative interchange design that is being used with increasing frequency in the United States because of the ability to use existing right-of-way and infrastructure frequently. This paper documents the state of the practice in DDI signal phasing with principles established in the Signal Timing Manual, namely, that it uses consistent phase numbering in a logical format to describe each of the phasing concepts being considered and discussed in this paper. Although some literature exists on several methods of signal phasing for DDIs, inconsistency in the reporting leaves practitioners scratching their heads when attempting to decipher what phasing scheme to use. In response, three fundamental phasing schemes are presented, one each for volume patterns with two, three, and four critical movements. Each scheme is described with a consistent naming convention, and, when possible, each is manipulated to provide varying coordination strategies. In addition, concepts such as use of actuation and barriers to improve coordination are described, and methods for reducing lost time are introduced. Other supplemental information related to preemption and pedestrians is discussed briefly. In conclusion, practitioners are given some basic guidance on when one phasing scheme may be more appropriate than another. |
Author | Urbanik, Thomas Warchol, Shannon Schroeder, Bastian J. Phillips, Stacie Tanaka, Alison Cunningham, Christopher |
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References | Cunningham C. (bibr8-2557-01) 2014 Report OR 10-021. (bibr5-2557-01) 2010 Rohlfs T. (bibr12-2557-01) 2014 bibr6-2557-01 Chlewicki G. (bibr10-2557-01) 2013 Chilukuri V. (bibr2-2557-01) 2011 bibr3-2557-01 Tian Z. (bibr13-2557-01) 2015 bibr11-2557-01 (bibr1-2557-01) 2014 bibr4-2557-01 (bibr7-2557-01) 2014 bibr9-2557-01 Hu P. (bibr14-2557-01) 2014 |
References_xml | – volume-title: Presented at 92nd Annual Meeting of the Transportation Research Board year: 2013 ident: bibr10-2557-01 contributor: fullname: Chlewicki G. – volume-title: Diverging Diamond Interchange: Performance Evaluation (I-44 and Route 13) year: 2011 ident: bibr2-2557-01 contributor: fullname: Chilukuri V. – volume-title: Field Evaluation of Double Crossover Diamond Interchanges year: 2014 ident: bibr8-2557-01 contributor: fullname: Cunningham C. – volume-title: Presented at Alternative Intersections and Interchanges Symposium year: 2014 ident: bibr12-2557-01 contributor: fullname: Rohlfs T. – volume-title: Presented at 93rd Annual Meeting of the Transportation Research Board year: 2014 ident: bibr14-2557-01 contributor: fullname: Hu P. – ident: bibr6-2557-01 – volume-title: Diverging Diamond Interchange Informational Guide year: 2014 ident: bibr1-2557-01 – ident: bibr4-2557-01 – ident: bibr11-2557-01 doi: 10.17226/22097 – volume-title: Presented at 94th Annual Meeting of the Transportation Research Board year: 2015 ident: bibr13-2557-01 contributor: fullname: Tian Z. – ident: bibr3-2557-01 – volume-title: Missouri’s Experience with a Diverging Diamond Interchange: Lessons Learned year: 2010 ident: bibr5-2557-01 contributor: fullname: Report OR 10-021. – ident: bibr9-2557-01 doi: 10.3141/2461-13 – volume-title: DDI Guideline: A UDOT Guide to Diverging Diamond Interchanges year: 2014 ident: bibr7-2557-01 |
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Title | Signal Timing for Diverging Diamond Interchanges: Fundamentals, Concepts, and Recommended Applications |
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