Publication: A study on average travel speed at two-lane highways in malaysia
Date
2011-03-01
Authors
Tan, Yong Kee
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Abstract
Average travel speed (ATS) is currently one of the crucial performance indicators in the determination for the level of service for two-way two-lane highways in Malaysia. It has become a common practice for designers in Malaysia to use guidelines based on the US HCM when designing these highways. Therefore, this study to investigate the ATS on Malaysian two-lane two-way highways is crucial in order to identify the real traffic conditions. This investigation is done to reveal the relationship between ATS and Free Flow Speed, factors affecting ATS as well as the relationship between ATS of passenger car and traffic compositions. The result shows that ATS is directly proportional to FFS, lane width and shoulder width. However, ATS is found to be inversely proportional to access point density. ATS increases when percentage of no passing zones increases which is at 11.43% to 55.67% of no-passing zones. After reaching a maximum point at 55.67% of no-passing zone, ATS will decrease when the percentage of no-passing zone continues to increase which is at of 55.67% to 85.71% of no-passing zones. For the case of ATSpc, it is directly proportional to the increase in percentage of class 2 and class 3 vehicles as well as the Free Flow Speed of passenger cars. However, it is inversely proportional to the increase of the class 4 and class 5 vehicles.