Saturation flow is the most significant parameter used in the design of signalized intersections. Reliable estimation of saturation flow is essential in order to evaluate level of service and capacity. The aim of the present study is to find out the effect of encroaching vehicles (vehicles standing beyond the stop line when red is given to that particular approach) on saturation flow and capacity at signalized intersections in mixed traffic conditions. In the present research work, from the regression analysis, two separate saturation flow models are developed from significant variables: approach width, proportion of two-wheelers and cars, one with considering encroaching vehicles (considering vehicles passing through reference line 2) and another without considering encroaching vehicles (considering vehicles passing through reference line 1 (stop line)). The data are collected from five signalized intersections: Suchitra, Malaparamba, University Cross roads, Gandimaisamma and Kazipet railway station Intersections in India. Saturation flow corresponding to 30 signal cycles are considered for each approach at selected five intersections, of which 20 cycles data are used for model calibration and 10 cycles data are used for model validation. The developed models showed variation in saturation flow with and without consideration of encroaching vehicles. The model which is developed considering encroaching vehicles is showing higher saturation flow value than the other one without considering the encroaching vehicles.
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Highway Capacity Manual (HCM), Transportation Research Board (2010)
A. Saha, S. Chandra, I. Ghosh, Saturation flow estimation at signalized intersections under mixed traffic conditions. Urban Transp. 176, 387–393 (2017)
H.D. Nguyen, Saturation flow rate analysis at signalized intersections for mixed traffic conditions in motor cycle dependent cities. Transp. Res. Procedia 15, 694–708 (2016)
P. Preethi, R. Ashalatha, Modelling saturation flow rate and right turn adjustment factor using area occupancy concept. Case Stud. Transp. Policy 6, 63–71 (2018)
M. Roshani, I. Bargegol, Effect of pedestrians on the saturation flow rate of right turn movements at signalized intersection–case study from Rasht city, in Materials Science and Engineering, vol 245 (2017)
J. Zhao, P. Li, X. Zhou, Capacity estimation model for signalized intersections under the impact of access points. PLOS 11, e0145989 (2016)
Z. Yang, P. Liu, Z.Z. Tian, W. Wang, Effect of left turn waiting areas on capacity and level of service of signalized intersections. J. Transp. Eng. 139(11), 1076–1085 (2013)
B.H.Susilo, Y. Solihin, Modification of saturation flow formula by width of road approach, in 6th International Symposium on Highway Capacity and Quality of Service, vol 16 (2011), pp. 620–629
J. Chodur, K. Ostrowski, M. Tracz, Impact of saturation flow changes on performance of traffic lanes at signalized intersection, in 6th International Symposium on Highway Capacity and Quality of Service, vol 16 (2011), pp. 600–611
Z.Z. Tian, N. Wu, Probabilistic model for signalized intersection capacity with a short right turn lane. J. Transp. Eng. 132(3), 205–212 (2006)
X. Le, J.J. Lu, E.A. Mierzejewski, Y. Zhou, Variation in capacity at signalized intersections with different area types. Transp. Res. Rec. 1710, 199–204 (2000)
Indian Highway Capacity Manual (Indo HCM), Council of Scientific and Industrial Research (CSIR), New Delhi (2017)
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Ramireddy, S., Sala, E. & Ravishankar, K.V.R. Effect of Encroaching Vehicles on Saturation flow at Signalized Intersections in Mixed Traffic conditions. J. Inst. Eng. India Ser. A 101, 273–279 (2020). https://doi.org/10.1007/s40030-019-00425-4
- Saturation flow
- Mixed traffic
- Stop line
- Encroaching vehicles