American Society of Civil Engineers


Speed Control for Traffic on Freeway Exit Deceleration Lanes


by Hongwei Li, (Transportation College, Southeast University, 2 Si-Pai Lou, Nanjing, Jiangsu 210096, China. E-mail: lihongwei-2008@163.com), Jian Lu, (School of Naval Architecture, Ocean and civil engineering, Shanghai Jiao Tong University, Shanghai, China, 200240. E-mail: jianjohnlu@sina.com), Guoqiang Zhang, (Transportation College, Southeast University, 2 Si-Pai Lou, Nanjing, Jiangsu 210096, China. E-mail: guoqiang.zhang@163.com), and Hanjie Tang, (Plant Layout and Transportation Division, Capital Engineering & Research Incorporation Limited, 4 Baiguang Road, Beijing, 100053, China. E-mail: tanghanjie@ceri.com.cn)
Section: Transportation Systems and Vehicle Design, pp. 2695-2700, (doi:  http://dx.doi.org/10.1061/41184(419)445)

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Document type: Conference Proceeding Paper
Part of: ICTE 2011
Abstract: Exiting traffic needs to decelerate speeds on the deceleration lanes of freeway and the speed on deceleration lanes is different from the speed on exit ramps. Thus, different post speed limits should be used for deceleration lanes and exit ramps, respectively. To decide a reasonable post speed limit on a deceleration lane segment, many factors should be considered and analyzed, such as exit ramp types, vehicle composition, traffic safe decelerating rate, traffic volume, etc. The significance of the contributing factors needs to be analyzed. With such an analysis, the models to predict safe operational speed on decelerating lane segments will be developed and the post speed limit on each deceleration lane segment will be obtained. In addition, a simulation model will be developed to evaluate the effectiveness and impacts of the developed post speed limits on traffic movements.


ASCE Subject Headings:
Traffic speed
Traffic flow
Simulation models