公路几何特征对通行能力影响分析

摘要/Abstract

摘要：

通行能力预测是公路设施规划、设计与运营中的基础环节.本文基于埃及曼努菲亚省12条农村双车道路段数据，研究了公路线形等几何特征对通行能力的影响以及线形由切线变为平曲线时通行能力的损失.所选取的路段线形包括直线和随后的平曲线.同时，采集了各路段上车流量及速度数据，利用基于基本图的外推法研究流量和密度关系.路段上不同车型的车辆均转换为小客车当量.此外，针对不同情形（切线、平曲线及对应流量损失），分别建立了最佳回归模型.结果表明，切线型道路的关键自变量是路宽、肩宽以及切线长；平曲线道路的关键变量是曲线半径和路宽.通行能力和几何特征关系最佳模型的自变量为曲线半径.本文的模型可用于分析评价农村双车道道路的通行能力，尤其是评价文中所研究路段的通行能力.

关键词: 公路运输, 通行能力, 公路几何学, 平曲线, 流量密度关系, 回归分析

Abstract:

The estimation of roadway capacity is essential in the planning, designing, and operation of highway facilities. This paper aims at assessing the influence of highway geometric characteristics on capacity at tangents and horizontal curves as well as on capacity loss at the change from tangent to curve. Traffic and geometry data obtained from twelve rural, twolane road sites in Minoufiya Governorate, Egypt, were used. Each site consists of a tangent element and the succeeding horizontal curve. Vehicle flows and speeds were collected at each element in the study sites. A capacity estimation method that was based on extrapolation from a fundamental diagram which represented the relationship between traffic flow and density was used. The effect of different vehicle types was accommodated for by converting them into equivalent passenger car units. Regression analysis was used to investigate the relationships between geometric characteristics and capacity. The best regression models for each case (i.e.capacity at tangents, capacity at curves, and capacity loss between the two elements) were introduced. For tangents, the significant independent variables are lane width, shoulder width, and tangent length. In the case of curves, the significant variables are curve radius and lane width. The best model that exhibits the relationship between capacity loss and geometry characteristics includes only curve radius, which functions as an independent variable. The models are very useful and can be used to deal with capacity analysis as well as for the evaluation of rural, twolane roads, especially for the area under study.

Key words: highway transportation, capacity, highway geometry, horizontal curve, flowdensity relationship, regression analysis

中图分类号:

U491

HASHIM Ibrahim Hassan, ABDEL WAHED Talaat Ali. 公路几何特征对通行能力影响分析[J]. 交通运输系统工程与信息, 2012, 12(5): 65-75.

HASHIM Ibrahim Hassan, ABDEL WAHED Talaat Ali. Effect of Highway Geometric Characteristics on Capacity Loss[J]. Journal of Transportation Systems Engineering and Information Technology, 2012, 12(5): 65-75.

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链接本文: http://www.tseit.org.cn/CN/abstract/abstract18465.shtml

http://www.tseit.org.cn/CN/Y2012/V12/I5/65

参考文献

[1] Transportation Research Board (TRB). Highway Capacity Manual (HCM)[M], 4th edition, TRB, National Research Council, Washington, D.C., 2000.
[2] Polus A., Craus J, Livneh M. Flow and capacity characteristics on two-lane rural highways[C]. Transportation Research Record, Transportation Research Board, National Research Council, Washington, D.C., 1991, 1320, 128–134.
[3] Nakamura M. Research and application of highway capacity in Japan[C]. 2nd International Symposium on Highway Capacity, 1994, Sydney, Australia, 103–112.
[4] Gibreel G, El-Dimeery I A, Hassan Y, et al. Impact of highway consistency on capacity utilization of two-lane rural highways[J]. Canadian Journal of Civil Engineering, 1999, 26(6): 789–798.
[5] Chandra S, Kumar U. Effect of Lane Width on Capacity under Mixed Traffic Conditions in India[J]. Journal of Transportation Engineering, ASCE, 2003, 129(2): 155–160.
[6] Yang X, Zhang N. The marginal decrease of lane capacity with the number of lanes on highway[C]. In: Proceedings of the Eastern Asia Society for Transportation Studies, 2005, 5, 739–749.
[7] Ben-Edigbe J, Ferguson N. Extent of capacity loss resulting from pavement distress[C]. In: Proceedings of the Institution of Civil Engineers: Transport, 2005, 158 (TR1): 27–32.
[8] Chandra S. Effect of road roughness on capacity of two-lane roads[C]. Journal of Transportation Engineering, ASCE, 2004, 130(3): 360–364.
[9] Chin S M, Franzese O, Greene D L, et al. Temporary losses of highway capacity and impacts on performance. U.S. department of energy (DOE)[EB/OL], Information Bridge, 04-209, 2002 (Website: http://www.osti.gov/bridge).
[10] Kim J, Elefteriadou L. Estimation of capacity of two-lane two-way highways using simulation model[J]. Journal of Transportation Engineering, ASCE, 2010, 136(1): 61–66.
[11] Hashim I H. Analysis of speed characteristics for rural two-lane roads: A field study from minoufiya governorate, Egypt[J]. Ain Shams Engineering Journal, 2011, 2(1): 43–52.
[12] Yao J, Rakha H., Teng H, Kwigizile V, et al. Estimating highway capacity considering two-regime models[J]. Journal of Transportation Engineering, ASCE, 2009, 135(9): 670–676.
[13] Yao J, Teng H, Wei H, et al. Estimating roadway capacity using the simultaneous spline regression model[J]. Journal of Transportation Systems Engineering and Information Technology, 2009, 9(1): 87–98.
[14] Minderhoud M, Botma H, Bovy P. Assessment of roadway capacity estimation methods[C]. Transportation Research Record, Transportation Research Board, National Research Council, Washington, D.C., 1997, 1572, 59-67.
[15] Harwood D, May A D, Anderson I et al. Capacity and quality of service of two-lane highways[R]. Midwest Research Institute, Final Report, NCHRP Project 1999, 3–55(3).
[16] van Arem B, van Der Vlist M J, de Ruiter J C, et al. A. design of the procedures for current capacity estimation and travel time and congestion monitoring[R]. DRIVE-11 Project V2044, Commission of the European Communities, (CEC), 1994.
[17] Minderhoud M, Botma H, Bovy P. Roadway capacity using the product-limit approach[C]. 77th Annual Meeting of the Transportation Research Board, Washington D.C, 1998.
[18] Chandra S, Sikdar P K. Factors affecting pcu in mixed traffic on urban roads[C]. Road and Transport Research, ARRB, Australia, 2000, 9(3): 40–50.
[19] Krammes R A., Crowley K W. Passenger car equivalents for trucks on level freeway segments[C]. Transportation Research Record, Transportation Research Board, National Research Council, Washington, D.C., 1986, 1091, 10–16.
[20] Polus A., Fitzpatrick K, Fambro D. Predicting operating speeds on tangent sections of two-lane rural highways[C]. Transportation Research Record, Transportation Research Board, National Research Council, Washington, D.C., 2000, 1737, 50–57.