Incorporating nonuniform arrivals in delay variability modeling at signalized intersections
- 52 Downloads
The delay vehicles experience at signalized intersections is one of the most important indicators for measuring intersection performance. The interpretation of delay variability evolvement at intersections gives a comprehensive insight into arterial traffic operation. Thus, an analytical model is proposed to investigate delay variability at coordinated intersections. Two different flow rates are assumed for both effective red and green periods in cumulative curves, through which the effect of signal coordination is incorporated in delay estimation. Then, an analogy of Markov chain process is used to explore the mechanism of stochastic overflow queue at signalized intersections. Numerical case studies show that with the decrease of arrival proportions during green, the shape of delay distribution in both undersaturation and oversaturation cases shifts faster towards higher values, implying that the coordination effect between paired intersections has a great effect on the delay distribution. As for delay fluctuation range, favorable coordination is demonstrated to be able to weaken the variability of delay estimates especially for undersaturation conditions.
Key wordsnonuniform arrival signalized intersection coordination effect delay variability
Unable to display preview. Download preview PDF.
- WEBSTER F V. Traffic signal settings [M]. Road Research Laboratory London, Her Majesty Stationary Office, 1958.Google Scholar
- GU Xiao-jun, LAN Chang-jen. Estimation of delay and its variability at signalized intersections [C]// TRB 88th Annual Meeting. Washington D C: TRB, 2009.Google Scholar
- ZHENG Fang-fang. Modeling urban travel time [D]. Delft, the Netherlands: Delft University of Technology, Transport and Planning, 2011.Google Scholar
- HURDLE V F. Signalized intersection delay models-A primer for the uninitiated [J]. Transportation Research Record, Transportation Research Board, 1984, 971: 96–105.Google Scholar
- SCATS. SCATS Traffic Reporter 6.4.2 user manual [R]. Australia, 2006.Google Scholar
- VITI F. The dynamics and the uncertainty of delays at signals [D]. Delft: Delft University of Technology, 2006.Google Scholar
- Highway capacity manual [M]. Washiongton D C: Transportation Research Board, 2000.Google Scholar
- OLSZEWSKI P S. Traffic signal delay model for non-uniform arrivals [J]. Transportation Research Record: Journal of Transportation Research Board, 1990, 1287:42–53.Google Scholar
- Highway capacity manual [M]. Washiongton D. C: Transportation Research Board, 2010.Google Scholar
- STRONG D W, ROUPHAIL N M. Incorporating the effects of traffic signal progression into the proposed incremental queue accumulation (IQA) method [C]// TRB 85th Annual Meeting. Washington D.C: TRB, 2006.Google Scholar
- VAN ZUYLEN H J, VITI F. A probabilistic model for queues, delays and waiting time at controlled intersections [C]// TRB 86th Annual Meeting. Washington D. C: TRB, 2007.Google Scholar