Abstract
Unsignalized intersections are those where at least one of the movements is controlled by a STOP or a YIELD sign. Operations of such facilities require the drivers on the controlled movements (usually referred to as minor movements) to judge the size of the gaps along the major (or uncontrolled) street and select a suitable one to cross or to merge into.
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References
Transportation Research Board, National Academies of Science (2010) Highway Capacity Manual, Transportation Research Board, National Research Council, Washington, DC
Kyte M, Tian Z, Mir Z, Hameedmansoor Z, Kittelson W, Vandehey M, Robinson B, Brilon W, Bondzio L, Wu N, Troutbeck R (1996) NCHRP Web Doc 5 capacity and level of service at unsignalized intersections: final report vol 1—two-way-stop-controlled intersections. Transportation Research Board, National Academies of Science, Washington, DC
Kyte M, Tian Z, Mir Z, Hameedmansoor Z, Kittelson W, VandeheyM, Robinson B, Brilon W, Bondzio L, Wu N, Troutbeck R (1996) NCHRP Web Doc 5 capacity and level of service at unsignalized intersections: final report vol 2—All-way-stop-controlled intersections. Transportation Research Board, National Academies of Science, Washington, DC
Rodegerdts L, Blogg M, Wemple E, Myers E, Kyte M, Dixon M, List G, Flannery A, Troutbeck R, Brilon W, Wu N, Persaud B, Lyon C, Harkey D, Carter D (2007) NCHRP Report 572: roundabouts in the United States. TRB, National Academies of Science, Washington, DC
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Problems
Problems
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1.
Conduct a literature review documenting methods for obtaining the critical gap of unsignalized intersection approaches. Which one would you recommend?
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2.
Examine your favorite microsimulator and document its algorithms for analyzing roundabouts. How does the model handle differences between the presences of a STOP sign used at TWSC intersections vs. a YIELD sign? How does the model handle critical gap determination for various driver populations and various vehicle types?
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3.
For the intersection of Example 10.2, use the HCM 2010 to calculate the capacity of the NB left-turn movement if it is provided its own lane, and the demand of the WB through movement is 670Â vph. How does the capacity of this movement change if the NB approach has a single lane? Assume that the demand of the NB left is 150Â vph.
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4.
Conduct a literature review to identify methods for the analysis of AWSC intersections. Document the process for estimating the probability of the presence of vehicles in the opposing and conflicting approaches.
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5.
Consider the demands shown in the figure below. Use your favorite microsimulator to evaluate the performance of the intersection if it is assumed it is a TWSC, an AWSC, or a roundabout. Which of the three designs is most effective for this particular set of demands? How would your response change as a function of the relative demands?
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6.
Conduct a literature review to identify guidelines when roundabouts are operationally more effective than TWSC or AWSC intersections.
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Elefteriadou, L. (2014). Unsignalized Intersections. In: An Introduction to Traffic Flow Theory. Springer Optimization and Its Applications, vol 84. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8435-6_10
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DOI: https://doi.org/10.1007/978-1-4614-8435-6_10
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