Entry and Circulating Flow Relationship at a Roundabout

Abdul Aziz Chik, and Othman Che Puan, and Chai, Ming Jing, (2004) Entry and Circulating Flow Relationship at a Roundabout. Malaysian Journal of Civil Engineering, 16 (1). pp. 48-60.

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Affiliations

Universiti Technologi Malaysia, Faculty of Civil Engineering.
Universiti Technologi Malaysia, Faculty of Civil Engineering.
Universiti Technologi Malaysia, Faculty of Civil Engineering.

Abstract

This study examined the two formulas stated in the Arahan Teknik (J) 11/87 of the Malaysian Public Work Department to estimate the capacity of small and conventional roundabouts. Field survey, which cover the roundabout inventories, and vehicle classification were carried out. Vehicle classification survey indicates lower entry flows at the single lane entries compared to the multilane entries for both morning and evening peak hours. Statistical analysis was used to identify the correlation between the circulating flows, entry flows and the entry width. Results showed that the capacity obtained from the weaving concept was generally higher than the regression equations for the single and multi entries. The difference between these results may be due to the regression equations that consider the interaction between the entry and circulating flow and the geometric parameters, while the Arahan Teknik (J) 11/87 only address the geometric parameter. The entry flows for both single and multilane entries were highly dependent on the circulating flows.

Kajian ini menilai dua rumus dalam Arahan Teknik (J) 11/87 oleh Jabatan Kerja Raya Malaysia, bagi menganggarkan muatan bulatan kecil dan konvensional. Pemerhatian di lapangan termasuk inventori bulatan, dan klasifikasi kenderaan telah dijalankan ke atas beberapa bulatan. Kajian klasifikasi kenderaan menunjukkan paras aliran masuk yang rendah di jalan masuk tunggal berbanding jalan masuk berbilang semasa aliran puncak pagi dan petang. Analisa statistik digunakan bagi mengenal pasti hubungan di antara aliran mengeliling, aliran masuk dan lebar masuk. Keputusan menunjukkan kapasiti yang diperolehi dari konsep menjalin keseluruhan adalah lebih tinggi dari persamaan regresi untuk jalan masuk tunggal dan berbilang. Perbezaan ini mungkin disebabkan oleh persamaan regresi mengambil kira interaksi di antara aliran masuk dan mengeliling serta geometri bulatan, manakala Arahan Teknik (J) 11/87 hanya mengambil kira parameter geometri. Bagi kedua-dua jalan masuk tunggal dan berbilang, aliran masuk sangat bergantung kepada aliran mengeliling.

Item Type:

Journal

Keywords:

Roundabout; Weaving Concept; Circulating Flow; Entry Flow. Bulatan; Konsep Jalin; Aliran mengeliling; Aliran Masuk.

Subjects:

T Technology, Engineering

ID Code:

6518