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Correlation between the Flow Rate and the 85th Percentile Operating Speed: The Insight of Empirical Traffic Studies at Jalan Kapar to Kuala Selangor

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  • Muhammad Syazani Ngadanan

    (School of Civil Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia)

  • Muhammad Akram Adnan

    (School of Civil Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia)

  • Tuan Badrol Hisham Tuan Besar

    (Departmetn of Technology and Supply Chain Management, Faculty of Business Management, UiTM Puncak Alam, Malaysia School of Civil Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia)

Abstract

This study was conducted to investigate the 85th percentile operating speed with the flow rate when approaching the school bridge of heavy vehicle. The site survey for this roadway is located at Jalan Kapar-Kuala Selangor, Selangor at SK Jeram Batu 20 school which is a multilane highways and road design standard is R5. Site condition in this area is flat terrain. Laser meter detector was used to collect the spot speed data of the Class 3 which heavy vehicles. Linear regression and paired t-test analysis was employed using Minitab statistical software to identify difference the 85th percentile operating speed versus the flow rate in Lane 1 and Lane 2. The results revealed that there is significant difference in the heavy vehicle speed in Lane regression model (Equation 1), was 58.40 km/h, which falls below the design speed for Jalan Kapar-Kuala Selangor (R5). Similarly, in Lane 2, the average speed was 73.60 km/h, exceeding the recommended speed limit. This indicates that investigate the correlation between the flow rate and the 85th percentile speed of heavy vehicles of two lanes when approaching the school bridge.

Suggested Citation

  • Muhammad Syazani Ngadanan & Muhammad Akram Adnan & Tuan Badrol Hisham Tuan Besar, 2025. "Correlation between the Flow Rate and the 85th Percentile Operating Speed: The Insight of Empirical Traffic Studies at Jalan Kapar to Kuala Selangor," International Journal of Research and Innovation in Social Science, International Journal of Research and Innovation in Social Science (IJRISS), vol. 9(4), pages 3503-3509, April.
    • Handle: RePEc:bcp:journl:v:9:y:2025:issue-4:p:3503-3509
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