iipp publishingJournal of Applied Engineering Science


DOI 10.5937/jaes17-21205
This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions. 
Creative Commons License

Volume 17 article 604 pages: 256 - 263

Lee Vien Leong*
Universiti Sains Malaysia, Malaysia
Tuti Azmalia Azai
City Council of Penang Island, Malaysia
Wins Cott Goh
Intelliroad Services, Malaysia
Shafida Azwina Mohd Shafie
Universiti Sains Malaysia, Malaysia

This study aims to assess and compare several free-flow speed measurement methods that are suitable for Malaysian multilane highways. Free-flow speed is defined as a speed where the driver can maintain their own desired speed without obstruction or without being influenced by other road users. Data collection was conducted at 16 sites across Peninsular Malaysia during peak and off-peak periods. The measurement methods use different criteria which includes linear speed-density relationship graphs, the average speed of vehicles recorded during low to moderate traffic volume and also the average speed of vehicles with a pre-determined headway. Subsequent analysis was conducted and compared by performing multiple regression analyses. Results indicate that measurement of free-flow speed based on pre-determined headway is the best-suited model for Malaysian multilane highways. The model was determined as the best fit due to its highest R value of 0.954 and the highest score of 12/15 for the performance indicator analysis. These findings can greatly contribute to traffic engineers of Malaysia in determining a more precise free-flow speed for the design and operational assessment of multilane highways in Malaysia.

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The authors wish to express their sincere gratitude to Highway Planning Unit, Ministry of Works Malaysia for funding this study and School of Civil Engineering, Universiti Sains Malaysia for the support.

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