The Outer Circular Highway (OCH) to the City of Colombo is a new access controlled highway, linking Colombo – Katunayake Expressway (CKE) and Southern Transport Development Project (STDP). It is 10 – 15 kms away from the City Centre and 29.10 kms long in total. It will connect the North and South more quickly as a by-pass to the Colombo City and disperse the traffic from / to Colombo more effectively, resulting in easing traffic congestions in the Colombo Metropolitan area.
| Length | 9.63 km |
| Width | 4-lane access controlled Highway |
| Design Speed | 100 km/hr |
| Structure | 6.5 km viaducts With Long Span 5 nos., overpass bridges 2 nos., underpass bridges retaining walls and Interchange at Kerawalapitiya Design Review and Construction Supervision |
The Kadawatha – Kerawalapitiya section of the Outer Circular Highway, connecting Colombo-Katunayake Expressway to OCH is of length 9.3km. The road trace passes through mainly poor soft ground including large section consisting of paddy sub-soil
The Highway in to be constructed to 4-lane standard with 4 nos 3.5m wide lanes with 2.0 m wide center – median 3.0m wide shoulder. The scope of work includes Roadway excavation, embankment formation, soft soil treatment
Construction of 5.8 Km viaducts 5 nos overpass bridges,02 nos underpass bridges retaining walls and Interchange at kerawalapitiya Construction of road pavement and entire drainage system for the expressway
