CONVERSION OF A LARGE ROUNDABOUT IN BAGHDAD CITY TO A SIGNALIZED INTERSECTION
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Abstract
This paper reports the conversion of a large unsignalised roundabout (HURIYA SQUARI!) relatively close to the University of Baghdad campus to a signalized intersection. The study focused on reduction of vehicle delay and queue length at this intersection area. During the course of this research project, two software packages for the analysis and design of isolated intersection, SIDRA (Akcelik, R.1986 and 1991) and HCS (Transportation Research Board, National Research Council 1994) were available. A trial site selected and the observed dara used in the evaluation of the SIDRA and HCS outputs. The evaluation process indicated that SIDRA produce vehicle delay, which is reasonably consistent with the observed vehicle delay. Hence, SIDRA software used in the evaluation of alternative designs of the HURIYA SQUARE intersection. Five proposals of signaling plans and four proposed geometric layouts examined. The first proposal evaluated on site; the other four proposals examined with aid of the SIDRA software. Based on the carried analysis, the intersection geometric layout, signal timing, and phasing plan which result in lower vehicle delay and higher reserved capacity selected.
The Local Authority (AMANAT BAHGDAD) adopted the selected design and the large roundabout converted to a signalized intersection. Observation of traffic behavior following the conversion indicates a considerable improvement in traffic movement performance
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Akcelik, R. (1986), Technical Manual ATM No. (19). Australian Road Research Board.
Akcelik, R. (1989), Traffic Signals: Capacity and Timing Analysis. Research reports ARR No. 12.1. Australian Road Research Board.
Akcelik, R. (1991), SIDRA 4.0 software status. Traffic Engineering + Control pp. 586-589.
Al-Kubaisy, M. T. (2000). Development of computer simulation program for vehicle behaviour at signal controlled junctions. M.Sc. thesis, University of Baghdad, College of Engineering.
Bull, P. and Dunne, G. M. (1983), Traffic signal control of Park Square roundabout. Proceedings of PTRC 11 Summer Annual meeting. University of Sussex, Vol. (P240).
Barrow, L. J. (1987), OSCADY: A computer program to model capacities, queues and delays at isolated traffic signal junctions. Transportation Road Research Laboratory (UK) TRRL. Research Report 105.
Chand, B. M. and Lines, J. (1987), TRANSYT - the latest developments. Traffic Engineering Control pp. 387-390.
Davies, P. and Jamieson, B. (1980), Traffic signal control of roundabous. Traffic Engineering and Control Vol. (19) No. (7), pp. 354-357.
Flanag, T. B. and Saher, R. 1. (1983), Signaled compelled roundabouts. Proceedings of the PTRZ 11the annual meeting, University of Summer, Vol (p240), pp. 181-187.
Hallworth, M. S. (1980). "High-performance' signal controllers. Traffic Engineering and Control Pp. 242-248,
Hewlett-Packard Company (1997), Intelligent transportation system. Draws from Internet.
Huddart, K. W. (1983), Signaling of Hyde Park corner, Dephant and Castle, and other Roundabouts. Proceedings of FTRC 11 Summer Annual meeting Univenity of Sanses, Vol.(P240) pp. 193-207
japan International Corporation Agacy (1988), The Baghdad City urban transportation improvement study
Khalaf. T. M. (1993), Treatment of traffic congestion at Anter Square and the regulation of traffic at nearby junctions Proceeding of conference of the Iraq Society of Occupational Health and Safety.
Khalaf. T. M. (1998), Improvement of there critical Intersections in Daghdad so minimize vehicles queue and delay. M.Sc. thesis, University of Baghdad, College of Engineering
Lines, CJ and Crabtree, M. H. (1983), The use of TRANSYT at signalized roundabouts. Traffic Engineering Control pp. 332-327,
Mohammed, I B. (2000), Development of models for exclusive in-turns at signalized intersections in Erbil City, Ph.D. thesis, University of Baghatal, College of Engineering
Scott Wilson Kirkpatrick and Partners (1980), Area Traffic Control, Groups 12 and 3, SieInspection Report. Baghdad Comprehensive Transportation Study (DCIS)
Sofia, GG. (1998) Development of traffic flow models at networks in Mod City. Ph.D. thesis
University of Baghdad, College of Engineering
Transportation Research Board National Research Council (1994) Highway Capacity Manual Special Report 209 Washington, DC.
Webster, F. V. (1960), Roundabout experiment. Traffic Engineering and Control. Vol.(2)No(5)pp. 266-271
Webster, F. V. (1960), Roundabout experiment. Traffic Engineering and Control Vol. (2) No (5 pp. 266-271.
Webster, F. V. (1977), Urban passenger transport, some trends and prospects. RRL 7.1 Crowthorne
wright, P. T. and Marie, C. S. (1984). An assessment of Denham roundabout conversion. Trafic Engineering and Control Vol (23) No (9) pp.422-426.