Car Equivalents Dependence on the Longitudinal Road Gradient on Two-lane Roads in Bosnia and Herzegovina
The main objective of this paper, based upon the extensive empirical research of free flow in local conditions, is to quantify the unfavourable impact of the flow structure on the road capacity using PCE (Passenger Car Equivalent) values as a function of longitudinal grade. Based on literature reviews and empirical research, it has been proved that the PCE value for all vehicle classes is directly correlated with the road gradient. The PCE values in free flow conditions have been determined for the approved vehicle classes. Based on the measured values, models for determining the average PCE value depending on the upward grade on two-lane roads have been developed. Comparison of the developed models in conditions of free traffic flow with the Highway Capacity Manual (HCM) models has shown lower PCE values in this research. Models for the percentage of PCE values PCE15%, PCE50% and PCE85% have also been established.
Rahka H, Lucic I. Variable Power Vehicle Dynamics Model for Estimating Truck Accelerations. Journal of Transportation Engineering. 2002;128(5):412-419.
Kockelman K. Changes in the Flow-Density Relation due to Environmental, Vehicle and Driver Characteristics. Transportation Research Record. 1998;1644:47-56.
Highway Capacity Manual. Transportation Research Board. Washington D.C.: National Research Council; 2000.
Hranac R, Sterzin E, Krechmer D, Rakha H, Farzaneh M. Empirical Studies on Traffic Flow in Inclement Weather. U.S. Department of Transportation: Federal Highway Administration, 2006; Publication No. FHWAHOP-07-073.
Al-Kaisy A, Jung Y, Rakha H. Developing Passenger Car Equivalency Factors for Heavy Vehicles during Congestion. Journal of Transportation Engineering. 2005;131(7):514.
Elefteriadou L, Torbic D, Webster N. Development of passenger car equivalents for freeways, two-lane highways and arterials. Transportation Research Record: Journal of Transportation Research Board. 1997;1572:51.
Bhuvanesh S. Simulation and Animation of Heterogeneous Traffic on Urban Roads [Ph. D. Thesis]. Indian Institute of Technology, Kanpur, India; 1999.
Khan SI, Maini P. Modeling Heterogeneous Traffic Flow. Transportation Research Record: Journal of Transportation Research Board. 1999;1678:234.
Chandra S, Sikdar PK. Factors affecting PCU in mixed traffic on urban roads. Road Transport Research. 2000;9(3):40.
Al-Kaisy A, Hall F, Reisman E. Developing passenger car equivalents for heavy vehicles on congested freeways: A capacity based approach. Presented at the 80th Annual Meeting of the Transportation Research
Board. Transportation Research Board, Washington, D.C.; 2001.
Al-Kaisy A, Hall F, Reisman E. Developing Passenger Car Equivalents for Heavy Vehicles on freeways during queue discharge flow. Transportation Research: Part A. 2002;36(8):725-742.
Bham GH, Benekohal RF. A High Fidelity Traffic Simulation Model based on Cellular Automata and Car-Following concepts. Transportation Research Part C: Emerging Technologies. 2004;12(1):1-32.
Chitturi MV, Benekohal RF. Passenger car equivalents for heavy vehicles in Work Zones. Presented at the 87th Annual Meeting of the Transportation Research Board. Transportation Research Board, Washington, D.C.; 2007.
Rongviriyapanich T, Suppattrakul C. Effects of motorcycles on traffic operations on arterial streets. Journal of Eastern Asia Society for Transportation Studies. 2005;6:137-146.
Ahmed U. Passenger Car Equivalent Factors for Level Freeway Segments Operating under Moderate and Congested Conditions [Master's Thesis]. Marquette University. Milwaukee, Wisconsin; 2009.
Štefančić G, Marijan D, Kljajić S. Capacity and Level of Service on the Zagreb bypass. Promet – Traffic & Transportation. 2012;24(3):261-267.
Highway Capacity Manual. Transport Research Board Publications. Volume 4. Applications Guide; 2010.
Seguin E, Crowley K, Zweig W. Passenger Car Equivalents on Urban Freeways. Report DTFH61-80-C-00106, FHWA. U.S. Department of Transportation; 1982.
Čelar N, Istraživanje vrednosti zasićenog saobraćajnog toka na osnovnoj uličnoj mreži grada Beograda, Tehnika – Saobraćaj, 2007;54(6):1-6.
Subotić M, Tubić V, Anđelković D. Research of the light duty vehicles equivalents at the mixed lanes of the signal crossroads at the central city zone. Mechanics Transport Communications: 20th International Scientific
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