Abstract
Passenger car equivalency (PCE) values provide a basis for estimating capacity of roadway and its elements such as signalized and unsignalized intersections. The present study aims to provide a novel framework to estimate dynamic PCE values for various vehicle classes under mixed traffic conditions for roundabouts. The data was collected and analyzed for the roundabout located in Chanakyapuri, New Delhi, India. In this study, PCE values of a particular vehicle class were estimated using entry versus circulating flow curves and a rational mathematical equation. Systematically calibrated VISSIM simulation tool helped in developing capacity curves for different vehicle proportions. With the help of entry capacity values for each approaching road, PCE values were obtained by comparing the car only flow with vehicle under consideration. Results show that PCE values are sensitive to traffic volume and composition. It is also observed that the PCE value increases with increase in opposing flow and vehicle proportion. For motorized three wheelers, PCE value exceeds one at high-circulating flow conditions as well as for larger proportion of motorized three wheelers in road traffic. The PCE value of motorized two wheelers varies from 0.34 in free flow condition to 0.7 in congested condition. It is noticed that the estimated PCE values of two wheelers do not differ much when compared to the past results. In heavy vehicles scenario, PCE values are inflated at high-circulating flow. This is due to their slow acceleration and deceleration characteristics.
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References
Lee YJ, Lee IG, Lee DM (2010) Determination of passenger car equivalents when estimating capacity at small 3-leg roundabouts. J Korean Soc Transp 28(6):65–74
Lee C, Ph D, Eng P (2015) Developing passenger-car equivalents for heavy vehicles in entry flow at roundabouts. J Transp Eng 141(8):1–7. https://doi.org/10.1061/(ASCE)TE.1943-5436.0000775
Highway Capacity Manual (2010) Transportation research board, USA
Pajecki R, Ahmed F, Qu X, Zheng X, Yang Y, Easa SM (2019) Estimating passenger car equivalent of heavy vehicles at roundabout entry using micro-traffic simulation. Front Built Environ 5:77
Giuffrè O, Granà A, Marino S, Galatioto F (2016) Microsimulation-based passenger car equivalents for heavy vehicles driving turbo-roundabouts. Transport 31(2):295–303
Giuffre O, Grana A, Tumminello ML, Sferlazza A (2017) Estimation of passenger car equivalents for single-lane roundabouts using a microsimulation-based procedure. Expert Syst Appl 79:333–347. https://doi.org/10.1016/j.eswa.2017.03.003
Giuffrè O, Granà A, Tumminello ML, Sferlazza A (2018) Capacity-based calculation of passenger car equivalents using traffic simulation at double-lane roundabouts. Simul Model Pract Theory 81:11–30
Macioszek E (2019) The passenger car equivalent factors for heavy vehicles on turbo roundabouts. Front Built Environ 5:68
Grana AG, Giuffrè O, Giuffrè T, Tumminello ML, Acuto F (2019) Passenger Car Equivalents for heavy vehicles at roundabouts. A synthesis review. Front Built Environ 5:80
Granà A, Giuffrè T, Macioszek E, Acuto F (2020) Estimation of passenger car equivalents for two-lane and turbo roundabouts using AIMSUN. Front Built Environ 6:86
Sonu M, Dhamaniya A, Arkatkar S, Joshi G (2016) Time occupancy as measure of PCU at four legged roundabouts. Transp Lett:1–12. https://doi.org/10.1080/19427867.2016.1154685.
Sugiarto S, Apriandy F, Faisal R, Saleh SM (2018) Measuring passenger car unit at four-legged roundabout using time occupancy data collected from drone. Aceh Int J Sci Technol 7(2):77–84
Ahmad A, Rastogi R (2019) Calibrating HCM model for roundabout entry capacity under heterogeneous traffic. J Mod Transp 27:293–305. https://doi.org/10.1007/s40534-019-00194-7
Indo-HCM (2017) Roundabouts. In: Development of Indian highway capacity manual
Arroju R, Gaddam HK, Vanumu LD, Ramachandra RK (2015) Comparative evaluation of roundabout capacities under heterogeneous traffic conditions’. J Mod Transp 35(6):310–324. https://doi.org/10.1007/s40534-015-0089-8
Li Z, DeAmico M, Chitturi MV, Bill AR, Noyce DA (2013) Calibrating VISSIM roundabout model using a critical gap and follow-up headway approach. In: 16th international conference road safety on four continents. Beijing, China (RS4C 2013). 15–17. Statens väg-och transportforskningsinstitut
Giuffrè O, Granà A, Tumminello ML, Sferlazza A (2018) Calibrating a microscopic traffic simulation model for roundabouts using genetic algorithms. J Intell Fuzzy Syst 35(2):1791–1806
Tettamanti T, Csikós A, Varga I, Eleőd A (2015) Iterative calibration of VISSIM simulator based on genetic algorithm. Acta Technica Jaurinensis 8(2):145–215
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Negi, V., Gaddam, H.K., Ramachandra Rao, K. (2023). Dynamic Passenger Car Equivalency Values for Multilane Roundabouts Under Mixed Traffic Conditions—A Case Study. In: Anjaneyulu, M.V.L.R., Harikrishna, M., Arkatkar, S.S., Veeraragavan, A. (eds) Recent Advances in Transportation Systems Engineering and Management. Lecture Notes in Civil Engineering, vol 261. Springer, Singapore. https://doi.org/10.1007/978-981-19-2273-2_5
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