PEFAA Colombo Chapter Field Visit to the Outer Circular Highway.

Over the past decade, high rises, new cities and modern road networks have become an increasingly common sight not just in the commercial capital of Colombo,but throughout the countryFor a country that relied mainly on roads that were built many decades back, dreams of expressways connecting Western Province with other Provinces will become true in coming days by Sri Lanka’s most successful story in terms of the country’s expressway network.In this regard the Outer Circular Highway could be regarded as the Expressway connecting all inter Provincial Expressways.


The Outer Circular Highway (OCH) inter connects the Southern Expressway, the Colombo-Katunayake Expressway and the Central Expressway. The construction of the OCH is in three stages; Stage I, from Kottawa to Kaduwela, Stage II (termed OCH-NS I) from Kaduwela to Kadawatha and Stage III (termed OCH-NS II) connecting Kadawatha to Kerawalapitiya. This report covers the construction and supervisory works on the contract covering OCH-NS II.

The Outer Circular Highway Phase III (OCH-NS II) is to be constructed as a four lane dual carriageway facility with provision for eventual expansion to six lanes. OCH-NS II is the final segment of the three segments of the Outer Circular Highway which links the Southern Expressway at Kottawa , the Colombo-Katunayake, at Kerawalapitiya and Central Expressway at Kadawatha.


The OCH-NS II Expressway is 9.63 Km in length. Kerawalapitiya Interchange will provide a facility for traffic travelling on the Southern Expressway to by-pass Colombo city by entering the Outer Circular Highway at Kottawa and entering A1 Highway at Kadawatha or else continue on to enter the Colombo-Katunayake Expressway. Further, Kadawatha Interchange will provide the linkage for vehicles travelling along Central Expressway to cross over to the Outer Circular Highway and beyond.

PEFAA Colombo Chapter has recently arranged the Field Visit to the Outer Circular Highway – Phase III on 3rd of October 2019. Around thirty participants have participated in the Field Visit. Participants have convened at Kadawatha, where the Outer Circular Highway crosses the existing Colombo Kandy Road (A1). Project Staff have briefed the participants about various aspects of the Phase III of the Project.


Participants travelled from Kadwatha to Kerawalapitiya along the Outer Circular Highway with the guidance of the Project Staff. They got an opportunity to witness the heavy constructions of the embankments, highway decks, construction of asphalt pavements and construction of tollgates.



The Consultants and the Project Staff of the OCH-NS II Expressway made an informative presentation about the design, construction, progress and challenges faced and how they solved those issues. The field visit concluded with the vote of thanks by Eng. S.G.G. Rajkumar, President, PEFAA Colombo Chapter and followed by refreshments.