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Reading: Future Impact of Current Toll-Gates on the Capacity of the Southern Expressway

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Future Impact of Current Toll-Gates on the Capacity of the Southern Expressway

Authors:

M. L. G. D. Kumari,

The Open University of Sri Lanka, LK
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P. G. D. Priyadarshana,

The Open University of Sri Lanka, LK
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K. S. Weerasekera

The Open University of Sri Lanka, LK
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Abstract

The Southern Expressway plays a vital role in national road network in Sri Lanka. Vehicles on Expressways can travel at uniform speeds throughout their journey offering advantages on fuel consumption and reduced travel time. The expressways ensure a hassle free safe journey due to the minimum obstructions to the traffic.

At present, all the interchanges along the Southern Expressway operate with manually operated toll gates. The efficiency of current toll gates was studied for the existing exit ramp lengths and it investigated whether their current efficiencies are sufficient for higher vehicle volume of the future traffic. To investigate the current toll gate efficiency on the capacity of Southern Expressway, the necessary data were collected from relevant organizations. From the collected data, peak days and peak hours were identified for each and every exit ramp of the Southern Expressway. By considering the peak hours, critical exit ramps were identified. After identifying critical exit ramps of the interchanges, traffic studies were conducted to obtain arrival and service rates in peak hours during the peak days. Then, after analyzing survey data, maximum queue lengths and longest individual delays for critical exit ramps along the Southern Expressway were found. Simultaneously the analysis was carried-out for a different number of gates.

Finally, maximum queue lengths and longest individual delays were compared with existing ramp lengths, and shortcomings were identified. By using suitable growth rates for the Southern Expressway, future traffic conditions were predicted. Subsequently, by using the maximum vehicular queue lengths, individual delays that could occur in the future were computed. Hence, these values were used to analyze the effect of the capacity of Southern Expressway due to the present toll gate arrangement. Therefore, it was able to recommend suitable off ramp lengths considering queue lengths and deceleration lengths. Recommendations were also proposed for future improvements to the service rates at toll gates.

DOI: http://doi.org/10.4038/ouslj.v9i0.7325
How to Cite: Kumari, M.L.G.D., Priyadarshana, P.G.D. & Weerasekera, K.S., (2015). Future Impact of Current Toll-Gates on the Capacity of the Southern Expressway. OUSL Journal. 9, pp.19–40. DOI: http://doi.org/10.4038/ouslj.v9i0.7325
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Published on 16 Dec 2015.
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