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Impact of Splitter-Island on Pedestrian Safety at Roundabout Using Surrogate Safety Measures: A Comparative Study

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Listed:
  • Zamir Karwand

    (Department of Urban and Regional Planning, Faculty of Built Environment & Surveying, Universiti Teknologi Malaysia, Johor 81310, Malaysia
    Department of Highway and Transportation Engineering, Kabul Polytechnic University, Kabul 1010, Afghanistan)

  • Safizahanin Mokhtar

    (Department of Urban and Regional Planning, Faculty of Built Environment & Surveying, Universiti Teknologi Malaysia, Johor 81310, Malaysia)

  • Koji Suzuki

    (School of Civil Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan)

  • Olakunle Oloruntobi

    (Faculty of Maritime Studies, Universiti Malaysia Terengganu, Kuala Terengganu 21300, Malaysia)

  • Muhammad Zaly Shah

    (Department of Urban and Regional Planning, Faculty of Built Environment & Surveying, Universiti Teknologi Malaysia, Johor 81310, Malaysia
    Centre for Innovative Planning and Development (CIPD), Faculty of Built Environment & Surveying, Universiti Teknologi Malaysia, Skudai 81310, Malaysia)

  • Siti Hajar Misnan

    (Department of Urban and Regional Planning, Faculty of Built Environment & Surveying, Universiti Teknologi Malaysia, Johor 81310, Malaysia)

Abstract

This study aimed to investigate the effects of the splitter-island on pedestrian safety at roundabouts, considering the interaction between pedestrians and vehicles. Traffic accident statistics have traditionally been used to assess traffic safety. This method has severe limitations when used to investigate the impact of a particular feature of traffic facilities on safety at a microscopic level. Most previous research on surrogate safety measures (SSMs) had, on the other hand, focused on studying the safety of traffic operation conditions. The impact of a particular geometric feature of a roundabout on safety has so far received little attention in the literature. Therefore, we evaluated pedestrian safety in the presence and absence of physical splitter-islands by taking advantage of comparative statistical analysis (SA) and Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) methods. The Towa-Cho roundabout in Nagano prefecture in Japan was chosen for this study because it allows for five approaches, three with a splitter-island and two without. From 33-hr video data, a total of 343 and 183 potential pedestrian-vehicle conflicts were detected in three crosswalks with splitter-islands and two crosswalks without splitter-islands, respectively. The minimum time-to-collision (TTC min ), post-encroach-time (PET), maximum speed (MaxS), and maximum deceleration-to-safety (DTS) measures were monitored using particle tracking velocimetry (PTV) software for potential pedestrian-vehicle conflicts. It was found that geometric differences were significantly reflected by SSMs, and TTC min was the most efficient among all. It was concluded that the splitter-island had a better safety performance than the roundabout approach.

Suggested Citation

  • Zamir Karwand & Safizahanin Mokhtar & Koji Suzuki & Olakunle Oloruntobi & Muhammad Zaly Shah & Siti Hajar Misnan, 2023. "Impact of Splitter-Island on Pedestrian Safety at Roundabout Using Surrogate Safety Measures: A Comparative Study," Sustainability, MDPI, vol. 15(6), pages 1-17, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:6:p:5359-:d:1100319
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    References listed on IDEAS

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    1. Elżbieta Macioszek, 2020. "Roundabout Entry Capacity Calculation—A Case Study Based on Roundabouts in Tokyo, Japan, and Tokyo Surroundings," Sustainability, MDPI, vol. 12(4), pages 1-21, February.
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    1. Mehrzad Hasanvand & Amir Saman Abdollahzadeh Nasiri & Omid Rahmani & Khaled Shaaban & Hossein Samadi, 2023. "A Conflict-Based Safety Diagnosis of SCI Roundabouts Using a Surrogate Safety Measure Model," Sustainability, MDPI, vol. 15(17), pages 1-19, September.

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