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Systems Approach to Develop High Mobility Road Network Plan for Sri Lanka


W. A. S. S. Weththasinghe ,

State Development & Construction Corporation, LK
About W. A. S. S.

Civil Engineer

AMIE(SL), B.Sc. Eng. (Hons) (Moratuwa)

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J. M. S. J. Bandara

University of Moratuwa, LK
About J. M. S. J.

Senior Professor in Civil Engineering

B.Sc. Eng. (Hons) (Moratuwa), PhD (Calgary) MIESL, CEng, FCILT

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Transportation between major commercial and socio economic hubs will play a vital role in the economy. Since existing road networks have developed based on historical and natural reasons and expressways also have come up with individual proposals with very little consideration on overall connectivity, a need for a systematic approach for future network development has become a necessity. This study focuses on developing a high mobility road network taking into account the possibility of upgrading existing roads as well.


Since Administrative Districts and their capitals have already established and developed, 25 District Capitals were selected as the primary centers to be connected and considered as main nodes in the high mobility road network. In addition, all expressway interchanges, other major A-Class road intersections and cities with major traffic attractions were considered as nodes when defining the initial road network.


During the analysis stage, development of minimum distance paths and minimum spanning tree were considered to identify bottlenecks, critical nodes and critical links. To identify the optimum network, two criteria, minimizing overall link length, maximizing network speed and achieving desired average speed levels, were considered. A methodology was developed to identify the links to be added or improved such that overall mobility level of the country is improved.
How to Cite: Weththasinghe, W.A.S.S. and Bandara, J.M.S.J., 2021. Systems Approach to Develop High Mobility Road Network Plan for Sri Lanka. Engineer: Journal of the Institution of Engineers, Sri Lanka, 54, pp.61–67. DOI:
Published on 03 Sep 2021.
Peer Reviewed


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