Browsing by Author "Sulaiman Olayinka Subair, Biliyamin Adeoye Ibitoye and Abdulrauf Toyin Kuranga"

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    Evaluating Traffic Operations at an Urban Roundabout in a Development City: Evidence from Gaakanbi, Nigeria
    (International Journal of Multidisciplinary Department, 2026-03-29) Sulaiman Olayinka Subair, Biliyamin Adeoye Ibitoye and Abdulrauf Toyin Kuranga
    Abstract Efficient operation of urban roundabouts is critical for managing traffic flow, particularly in rapidly growing cities characterized by heterogeneous traffic conditions. This study evaluates the operational performance of Gaa Akanbi Roundabout using established traffic engineering metrics, including average control delay, queue length, and Level of Service (LOS), in accordance with Highway Capacity Manual (HCM) standards. Field data were obtained through direct geometric measurements and video-based traffic surveys conducted during peak periods over seven consecutive days. Traffic volumes and turning movements were manually extracted from recorded footage, while performance indicators such as delay and queue length were computed using standard analytical procedures. The results indicate that the roundabout operates at an overall average delay of 34.5 seconds per vehicle, corresponding to LOS C, which reflects stable but moderately delayed traffic conditions. However, significant disparities were observed across individual approaches. The western approach exhibited the poorest performance, with a delay of 46.2 seconds per vehicle (LOS E), indicating oversaturation largely due to limited entry capacity and inadequate geometric design. The southern and northern approaches recorded delays of 38.5 seconds and 30.2 seconds per vehicle, respectively, both operating at LOS D, suggesting moderate congestion with relatively stable flow conditions. In contrast, the eastern approach demonstrated comparatively efficient International Journal of Multidisciplinary Department Published by: International Journal & Research Global Publisher ISSN: 3108-2718 Article History: Received: 09 March 2026 | Accepted: 18 March 2026 | Published: 29 March 2026 DOI: https://doi.org/10.5281/zenodo.19313415 ** Related declarations are provided in the final section of this article. Contact IJRGP Copyright & Licensing Page 2 of 12 This article is licensed under a Creative Commons Attribution 4.0 International License. operation, with a delay of 23.1 seconds per vehicle (LOS C), characterized by lower conflict levels and shorter queues.
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    Evaluation and Improvement of Traffic Flow and Delay at Eko-Ende Intersection in Ikirun, Osun State, Nigeria
    (2024-12-31) Sulaiman Olayinka Subair, Biliyamin Adeoye Ibitoye and Abdulrauf Toyin Kuranga
    Abstract: The rapid increase in traffic volume in Ikirun has led to rising congestion across the town’s road network. Stop delay, a significant indicator of intersection performance, is commonly used to assess the level of service (LOS) and capacity. This study investigated delays at the Eko-Ende intersection, a critical point in Ikirun’s traffic system that connects commercial hubs such as Ikirun Garage, Osogbo-Ilorin Road, Monday Market, and Alamisi Market. A geometric evaluation of the intersection showed approach widths of 7.2 m for Moshadek, 7.0 m for Kereje, 10.73 m for Sawmill, and 14.8 m for Nazeem. Traffic volume assessments revealed Sawmill as the busiest approach, with a weekly average peak-hour volume of 1,773 vehicles, followed by Moshadek and Kereje with 1,553 and 1,362, respectively, while Nazeem had the lowest volume at 876. The average peak-hour volume across the intersection was 5,566 vehicles. Delay studies indicated Sawmill had the highest delay (14.7 s), while Moshadek had the lowest (8.8 s), with an overall intersection LOS of B.