Investigation of the effect of geometric irregularities on capacity of traffic circles by using partial least squares regression method

Avsar Y. O., Yildirim Z. B., Politi R. R., TANYEL S.

CANADIAN JOURNAL OF CIVIL ENGINEERING, vol.51, no.12, pp.1388-1408, 2024 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 51 Issue: 12
  • Publication Date: 2024
  • Doi Number: 10.1139/cjce-2023-0483
  • Journal Name: CANADIAN JOURNAL OF CIVIL ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Agricultural & Environmental Science Database, Applied Science & Technology Source, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, Communication Abstracts, Compendex, Computer & Applied Sciences, Environment Index, Geobase, ICONDA Bibliographic, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Page Numbers: pp.1388-1408
  • Keywords: traffic circles, roundabouts, capacity, geometric design, partial least squares regression, K-Means
  • Dokuz Eylül University Affiliated: Yes

Abstract

This paper examined the impact of geometric irregularities on the intersection capacity at traffic circles. A new empirical capacity relation was proposed to predict the capacity of the traffic circles as a function of geometric elements, exit and circulating flows. Within this scope, first, the relationship between the vehicles entering from the minor approach and the circulating flow from the turning movement in the traffic circle was examined based on the K-Means cluster analysis method. The analysis was created in accordance with an exponential relationship between entry and circulating flow. Second, two clusters were selected by the partial least squares regression method to improve the model's effectiveness. Lastly, to validate the model, "leave-one-out" cross-validation was used to select the components that maximize the model's predictive ability. The results show that geometric parameters of a traffic circle create different effects on capacity, especially in different circulating flow conditions.