Impact of urban morphological changes on traffic performance of Jadriyah intersection

Abstract

The realization of the nexus between morphological changes and road intersection performances remains a challenge in urban studies. Despite the effort spent on minimizing the traffic associated problems (such as congestion and delay) in urban intersections, namely using roundabouts, signalized intersections, and actuated traffic signal controls, there are still traffic performance inefficiencies within intersections. Traffic congestion in the intersection arises for two reasons, namely by densification formed in the surrounding area and by the lack of effective traffic management. In this paper, a morphological analytical approach was adopted to explain the urban intersection changes for a 1 sq. km study area within Jadriyah neighborhood. The study spans three historical phases (1999, 2009, and 2019) and describes the changes to urban morphology by integrating land-use development with traffic data. Problems regarding urban variation in this prominent intersection were measured and then compared in terms of the Level-of-Service (LOS). The deployment of measurement and analytical methods include two sets of measurements: firstly, the study of the morphology of urban form structures, and secondly the data analysis of volume, pedestrian movement, saturation flow, and signal timing during peak hours whilst counting the daily trips generated for each type of changed land use pattern. Analysis of the collected data revealed that the ABOUT THE AUTHORS Dhirgham Alobaydi is Chair in the Department of Architecture Engineering at the University of Baghdad. Many of his research projects and publications have focused on the morphological developments of the Iraqi metropolis; particularly the urban form and spatial structures.Hasan Al-Mosawe is a university lecturer in Al-Nahrain University -civil engineering department, his research interest is transport and highway design and material analysis.Amjad Al-Bayati is a professor in the civil engineering department at the university of Baghdad and the director of consulting engineering bureau at the university. His research interest is traffic characteristics and highway design and material sustainability.

Impact of Reach Centralities on Urban Accessibility and Connectivity: Insights from Iraq

“…Alobaydi and Rashid (2017a) investigate the morphological evolution of the urban core in Baghdad in the 19 th and 20 th centuries (Alobaydi and Rashid, 2017a). Other studies, such as those by Hammoodi and Al-Hinkawi (2023), Al Hashimi and Alobaydi (2023), and Alsaffar and Alobaydi (2023), examine the religious buildings of Mosul with spatial value reconstruction, historic urban networks of Baghdad, and the street configurations and land uses in downtown Baghdad, respectively (Hammoodi and Al-Hinkawi, 2023;Al Hashimi and Alobaydi, 2023;Alsaffar and Alobaydi, 2023;Alobaydi et al, 2020). These studies contribute significantly to the understanding of urban network analysis in specific settings.…”

Urban Ventilation in the Compact City: A Critical Review and a Multidisciplinary Methodology for Improving Sustainability and Resilience in Urban Areas

“…The expression urban model has been used to characterize studies focused on the analyses of urban dynamics, i.e., urban complexity [99]; pedestrian flows [100][101][102]; urban intensity [103,104]; city model as polycentric cities [105,106], compact cities [107], and concentric cities [108]; urban evolution [109][110][111][112][113][114][115][116][117][118]. The term transport denotes studies investigating the impact of urban morphology on the intersection traffic [119], goods movement [120], and multi-mode transport [121]. Finally, the term design indicates studies dealing with design strategies for mitigating flood risk [122], environmen-tally sustainable design [123], and optimized form generation [124].…”