Prije odabira projektnog rješenja raskrižja važan korak jeste provjera opravdanosti izgradnje temeljem definiranih kriterija. Jedan od ključnih kriterija jeste analiza propusne moći (kapaciteta). U svijetu postoji velik broj modela kapaciteta kružnih raskrižja koji su uglavnom prilagođeni uvjetima zemlje iz koje potječu, te ih je potrebno kalibrirati za lokalne uvjete. Ključni parametri za kalibraciju su kritična vremenska praznina i vrijeme slijeda. Vrijeme slijeda se može direktno mjeriti na terenu, a kritična praznina ne može, već se procjenjuje. Postoji veliki broj metoda procjene kritične vremenske praznine (preko 30) i sve daju različite vrijednosti. Različite vrijednosti kritične vremenske praznine rezultiraju različitim vrijednostima procjene kapaciteta. Stoga se nameće pitanje koja metoda daje realnije procijene u određenim uvjetima. U ovom radu su odabrane 4 najčešće korištene metode procjene kritične vremenske praznine (RAFF, MLM, WU, LOGIT) kako bi se testirale usporedbom rezultata teorijskih modela kapaciteta i stvarnog mjerenog kapaciteta na malom urbanom kružnom raskrižju.
Hagring O. Vehicle-Vehicle Interactions at roundabouts and their Implications for the Entry Capacity. PhD Thesis. Lund University; 1998.
Yap YH, Gibson HM, Waterson BJ. An International Review of Roundabouts Capacity Modeling. Transport Reviews. 2013;33(5): 593-616. Available from: doi:10.1080/01441647.2013.830160
Barry CD. Calibration of the HCM 2010 Roundabout Capacity Equations for Georgia Conditions. Master Thesis. Georgia Institute of Technology; 2012.
Giuffrè O, Granà A, Tumminello ML. Gap-Acceptance Parameters for Roundabouts: A Systematic Review. European Transport Research Review. 2016;8(1). Available from: doi:10.1007/s12544-015-0190-4
Pimentel Vasconcelos AL, Maia Seco Álvaro J, César Bastos Silva AM. Comparison of Procedures to Estimate Critical Headways at Roundabouts. Promet – Traffic & Transportation. 2013;25 (1): 43-53. Available from: doi:10.7307/ptt.v25i1.1246
Cvitanić D. Modeliranje kapaciteta i razine usluge nesemaforiziranih raskrižja [Modelling of capacity and level of service at unsignalized intersections]. Magistarski rad. Sveučilište u Splitu; 2000. Croatian
Pimentel Vasconcelos AL, Maia Seco Álvaro J, César Bastos Silva AM, Abreu T, Silva J. Comparison of Roundabout Capacity Models. In: Proceedings of the IASTED International Conference on Modeling: Simulation and Optimatization, 3-5 July 2012, Banff, Canada. Available from: doi:10.2316/P.2012.783-023
Highway Capacity Manual, HCM 2010. Washington DC, USA: Transportation Research Board (TRB), National Research Council; 2010.
Akcelik R. An Assessment of the Highway Capacity Manual 2010 Roundabout Capacity Model. Proceedings of the 3rd International Conference on Roundabouts, Carmel, Indiana. Washington DC, USA: Transportation Research Board of the National Academies; 2011.
Wu N. A universal procedure for capacity determination at unsignalized (priority-controlled) intersections. Transportation Research Part B: Methodological. 2001;35(6): 593-623. Available from: doi:10.1016/S0191-2615(00)00012-6
Brilon W. Roundabouts: A State of the Art in Germany International Roundabout Conference, Transportation Research Board, 18-20 May 2011, Carmel, Indiana, USA.
Tian Z, Vandehey M, Robinson BW, Kittelson W, Kyte M, Troutbeck R, Brilon W, Wu N. Implementing the Maximum Likelihood Methodology to Measure a Driver’s Critical Gap. Transportation Research. Part A: Policy and Practice. 1999;33(3-4): 187-197. Available from: doi:10.1016/S0965-8564(98)00044-5
Wu N. Estimating Distribution Function of Critical Gaps at Unsignalized Intersections Based on Equilibrium of Probabilities. Transportation Research Record. 2012;2286(2286). Available from: doi: 10.3141/2286-06
Abishai P, Yoram S, Sitvanit SL. Evaluation of the Waiting-Time Effect on Critical Gaps at Roundabouts by a Logit Model. European Journal of Transport and Infrastructure Research. 2005;5(1): 1-12.
Johnsons TM. Synthesis of Roundabout Geometric Capacity Measurement: Calibration and Validations to US Field Measurement. Transportation Research Board Annual Meeting, TRB 2012, Washington, D.C.
Guest Editor: Eleonora Papadimitriou, PhD
Editors: Dario Babić, PhD; Marko Matulin, PhD; Marko Ševrović, PhD.
Accelerating Discoveries in Traffic Science |
2024 © Promet - Traffic&Transportation journal