Determinations of critical gap and follow-up time at roundabouts in Jordan

Nabil Hazim; Subhi M. Bazlamit; Zaydoun Abu Salem; Omar Alghazawi; Issam Odeh

doi:10.7409/rabdim.019.015

Published: 2019-10-01

Vol. 18 No. 3 (2019)

Determinations of critical gap and follow-up time at roundabouts in Jordan

Nabil Hazim , Subhi M. Bazlamit , Zaydoun Abu Salem , Omar Alghazawi , Issam Odeh

Section: Articles

https://doi.org/10.7409/rabdim.019.015

Abstract

Critical gap and follow-up times are two important fundamental traffic parameters used in the design and operational analysis of roundabouts and un-signalized intersections. Moreover, they are used to assess capacity and level of service at minor roads. In Jordan, roundabouts are used extensively, and therefore, there is a need to conduct studies on follow-up and critical gap time. The driver behaviour in Jordan can be described as aggressive in terms of their choice of follow-up headway at roundabouts. In this study, the roundabouts were located in mountainous terrain which allowed the collection of critical gap observations for approach slopes ranging from 6% up to 8%. The critical gap and follow-up times were recorded and analyzed. This research also identified other factors affecting critical gap, lag and follow-up times such as geometry of roundabout, slope of the approach, culture and behaviour of drivers. This research also proposes a significant relationship between approach slope at roundabouts and the observed gap. This relationship may be incorporated in the estimation of capacity and level of service determination at roundabouts. The results of this study should assist highway and traffic designers in the design and the performance evaluation of roundabouts.

Keywords:

approach gradient, critical time gap, follow-up time, lag time, roundabouts.

Similar Articles

Renata Żochowska, Marcin Jacek Kłos, Piotr Soczówka, The analysis of traffic safety on the intersections of roadways and tram tracks , Roads and Bridges - Drogi i Mosty: Vol. 20 No. 1 (2021)
Piotr Radziszewski, Jerzy Piłat, Michał Sarnowski, Karol J. Kowalski, Jan B. Król, Influence of high temperature on properties of materials used in bridge asphalt pavement structures , Roads and Bridges - Drogi i Mosty: Vol. 14 No. 3 (2015)
Jarosław Bęc, Tomasz Lipecki, Andrzej Flaga, Grzegorz Bosak, Model investigations and numerical analysis of an arch shaped footbridge , Roads and Bridges - Drogi i Mosty: Vol. 12 No. 4 (2013)
Urszula Kołodziejczyk, Michał Ćwiąkała, Analysis of the results of model investigation of water capillary rise in road embankments , Roads and Bridges - Drogi i Mosty: Vol. 8 No. 4 (2009)
Mirosław Graczyk, Marcin Gajewski, Radosław Szczerba, Structural analysis of airfield concrete pavement with doweled joints taking into account curling of slabs , Roads and Bridges - Drogi i Mosty: Vol. 15 No. 2 (2016)
Agata Jaździk-Osmólska, Pandora - valuation method of social costs of road accidents in Poland , Roads and Bridges - Drogi i Mosty: Vol. 14 No. 2 (2015)
Dominik Pisarski, Czesław Bajer, Active damping of vibrations of one dimensional continuum under a moving load , Roads and Bridges - Drogi i Mosty: Vol. 8 No. 4 (2009)
Damian Bęben, European Ecological Network Nature 2000 and development of the transportation routes , Roads and Bridges - Drogi i Mosty: Vol. 8 No. 4 (2009)
Paweł Kossakowski, Load-carrying capacity of steel railway bridges subjected to long term service according to Eurocode Standards , Roads and Bridges - Drogi i Mosty: Vol. 13 No. 2 (2014)
Anna M. Rakoczy, Aleksandra Jivan-Coteti, Estimation of the current structural reliability level of existing railway bridges and viaducts , Roads and Bridges - Drogi i Mosty: Vol. 20 No. 3 (2021)

<< < 1 2 3 4 5 6 7 8 9 10 > >>

You may also start an advanced similarity search for this article.

Download files

PDF

Citation rules

Hazim, N., Bazlamit, S. M., Salem, Z. A., Alghazawi, O., & Odeh, I. (2019). Determinations of critical gap and follow-up time at roundabouts in Jordan. Roads and Bridges - Drogi I Mosty, 18(3), 227–234. https://doi.org/10.7409/rabdim.019.015

Cited by / Share

References

Highway Capacity Manual. TRB, National Research Council, Washington, D.C., 2000
Google Scholar

Akçelik R.: A review of gap-acceptance capacity models. The 29th Conference of Australian Institutes of Transport Research (CAITR 2007), University of South Australia, Adelaide, Australia. 5-7 December 2007
Google Scholar

Vasconcelos A.L.P., Seco Á.J.M., Silva A.M.C.B.: Comparison of procedures to estimate critical headways at roundabouts. Promet-Traffic & Transportation, 25, 1, 2013, 43-53, DOI: 0.7307/ptt.v25i1.1246
Google Scholar

Weinert A.: Estimation of critical gaps and follow-up times at rural unsignalized intersections in Germany. Fourth International Symposium on Highway Capacity, June 2000, Maui, Hawaii, Transportation Research Board, E-C018, 2000, 409-421
Google Scholar

Macioszek E.: The movement model for small roundabouts with minor roads capacity estimating. Transport Problems, 2, 1, 2007, 87-94
Google Scholar

Xu Feng, Tian Zong Z.: Driver behavior and gap-acceptance characteristics at roundabouts in California. Transportation Research Record, 2071, 1, 2008, 117-124
Google Scholar

Flannery A., Datta T.: Operational performance measures of American roundabouts. Transportation Research Record, 1572, 1, 1997, 68-75
Google Scholar

Hazim N.: Simulation of Traffic Flow at Roundabouts. Ph. D Thesis, Polytechnic Institute of Wrocław, Department of Civil Engineering, 1992, Wrocław, Poland.
Google Scholar

Wu N.: A universal procedure for capacity determination at unsignalized (priority-controlled) intersections. Transportation Research Part B: Methodological, 35, 6, 2001, 593-623
Google Scholar

Tanyel S.A.: Capacity calculation method for roundabouts in Turkey (Doctoral dissertation. Ph.D. Thesis, Technical University of Istanbul, Institute of Science and Technology, Istanbul, Turkey, 2001
Google Scholar

Troutbeck R.J.: Capacity and design of traffic circles in Australia. Transportation Research Record, 1398, 1993, 68-74
Google Scholar

WSDOT Design Manual M 22.01.10, Chapter 1320 Roundabouts, 2013, 1320-1 - 1320-28
Google Scholar

Saplioglu M., Karaşahin M.: Predicting Critical Gap Using FuzzyLogic Method at Unsignalized Urban Intersection. The 3rd Word Conference on Information Technology, (WCIT-2012), AWERprocedia Information Technology and Computer Science, 3, 2013, 1556-1564
Google Scholar

Sahraei M.A., Puan O.C.: Determination of gap acceptance at priority intersections. The Proceedings of 8th SEATUC Symposium, Chapter OS08: Transportation Engineering, 4, March 2014, 9-12
Google Scholar

Sahraei M.A., Puan O.: Traffic Delay Estimation Using Artificial Neural Network (ANN) at Unsignalized Intersections. Proceedings of the 3rd International Conference on Civil, Structural and Transportation Engineering (ICCSTE’18), 10-12.06.2018, Niagara Falls, Canada, Paper 106, 2018, 1-11, DOI: 10.11159/iccste18.106
Google Scholar

Hazim N., Wolek C.: Vehicle Speed Distribution on the Street Horizontal Curves. Drogownictwo, XLVIII, 7, 1993, 167-168
Google Scholar

Hazim N.: Simulation of left-turning movement at signalized intersections. Damascus University Journal for Studies and Scientific Research - Engineering Sciences Series, 17, 1, 2001, 54-70
Google Scholar

Hazim N., Jannoud A.: Simulation of traffic flow at unsignalized intersections. Tishreen University Journal for Studies and Scientific Research - Engineering Sciences Series, 28, 2, 2006, 28-49
Google Scholar

Nabil Hazim

n.hazim@amman.edu.jo

Affiliation:

Al-Ahliyya Amman University,, Department of Civil Engineering, 19328 Amman, Jordan

Subhi M. Bazlamit

Affiliation:

Al-Zaytoonah University of Jordan, Department of Civil and Infrastructure Engineering, 11733 Amman, P.O. Box: 130, Jordan

Zaydoun Abu Salem

Affiliation:

Applied Science Private University, Department of Civil Engineering, 21 Al Arab St., 11931 Amman, P.O. Box: 166, Jordan

Omar Alghazawi

Affiliation:

Al-Ahliyya Amman University,, Department of Civil Engineering, 19328 Amman, Jordan

Issam Odeh

Affiliation:

Al-Zaytoonah University of Jordan, Department of Basic Sciences, Amman, Jordan

Determinations of critical gap and follow-up time at roundabouts in Jordan

Abstract

Keywords:

Similar Articles

Downloads

Nabil Hazim

Subhi M. Bazlamit

Zaydoun Abu Salem

Omar Alghazawi

Issam Odeh