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Outer Circular Highway

Introduction

The outer Circular Highway (OCH) is located in the Colombo Metropolitan Region and passes through two administrative districts, namely Colombo and Gampaha. This highway runs around 20 km away from the City centre of Colombo, connecting radial routes and has a total length of 29.2 km. The northern end of the highway is located at Kerawalapitiya on Colombo-Katunayake Expressway and the southern end is located at Kottawa on Colombo-Ratnapura-Wellawaya-Batticaloa (A004) road where Southern Expressway meets OCH.

The OCH is to be developed as a 4-lane Highway with provision for future expansion to 6-lanes. The design speed of the Highway is 100 kmph.

     
     
The expressway is implemented in three phases as given below;
     
Phase - 1 Section from Kottawa to Kaduwela
11.0 km
Phase - 2 Section from Kaduwela to Kadawatha
8.9 km
Phase - 3 Section from Kadawatha to Kerawelapitiya
9.3 km
Total length:
29.2 km

 

 

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OCH Map as at 01 October 2013
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 Project Objectives
  1. To minimize traffic congestion and encourage development away from the highly populated urban areas in the Western province achieving better balance for growth.
  2. To provide an effective bypass for North-South bound traffic and to reduce through-traffic in the city of Colombo.
  3. To provide passenger transport to destinations in a minimum time period.
  4. To provide a quick passenger and good transport facility from airport.

Anticipated Benefits

  1. To encourage foreign investors by reducing travel time by improving infrastructure facilities.
  2. To minimise environmental impacts created by burning of fuel due to traffic congestion.
  3. To encourage the development of current or future growth centres by providing connections in between. 
  4. Servicing of relatively short-distance trips between existing and future growth centres.
  5. Quick development of interchange areas will increase property value and creation of new employment opportunities.

 

Project Details of Outer Circular Highway Project

Outer Circular Highway Project - Phase I : Kottawa - Kaduwela

Details of Project Roads:

Description
Length (km)
Width (m)
   Main Trace : Viaduct
3.3
22.1
Road Trace
7.7
26
   Link Roads   

   For Interchanges
0.6
26.5
0.4
13.0
0.2
21.2
   Ramps : Two way
1.0
16.0
One way
5.2
8.5
   Approach Roads
0.4
6.5
0.4
13.0
0.8
7.7
0.3
4.5
0.3
11.2
0.8
11.2
0.2
10.0
Total
21.6

Total Cost : USD 189.65 Mn

Total Cost Includes :

  • 4 Lane expressway for a length of 7.7 km
  • Construction of 4 lane Viaduct where the total length is 3.3 km
  • Construction of Bridges, Over passes and Underpasses where the total is 11 Nos.
  • Construction of Large size Box Culverts where the total is 27 Nos.
  • Soft ground Treatment of 80% of the total road length
  • Provision of Communication, Monitoring & Tolling system covering the entire length
  • Road lighting for inter sections area
  • Construction of Toll booths for Athurugiriya and Toll booths for Kothalawala.
  • All Contractual of claims made by the contractor
  • Landscaping and planting of trees
  • Traffic sings & lane marking for entire length

 

Outer Circular Highway Project - Phase II (Northern Section I) : Kaduwela - Kadawatha

Details of Project Roads:

Description
Length (km)
Width (m)
   Main Trace :  
8.9
33
   Link Roads (A1 bypass)  
2.02
25
   Earth Ramps
1.88
25
   Ramps Viaduct
1.62
15
   Total Effective Length
14.42
   Frontage Roads
0.75
3
0.44
4
1.74
6
1.18
3.5
0.21
2
   Toll Access
0.52
4
Total
19.26

Contract Sum : Rs. 44.88 Bn

Notes:

  1. This cost including 4 lane Expressway of total length 14.36 km
  2. Above 14.36 km includes 4 lane via-duct length of 4.37 km with provision for additional 2 lanes future expansion, one lane via-duct (Ramps) 1.62 km
  3. The cost includes 05 Nos. of Overpass Bridges and 6 lane Bridge over Kelani River, total length of 250 m.
  4. Construction of 23 Nos. Box culverts.
  5. Soft ground treatment of 43% of total road area.
  6. Construction of 3 Toll office buildings and 6 Toll Plazas excluding electronic Toll System.
  7. Road lighting only for interchanges and Over passes.
  8. Landscaping and planting of trees, Traffic Signals & Signs.
  9. Main drainage canal at Kadawatha interchange approximately length of 900 m.

Outer Circular Highway Project - Phase III (Northern Section II) : Kerawalapitiya - Kadawatha.

Details of Project Roads:

Description
Length (km)
Width (m)
Main Trace
9.32
31.5
Ramps
1.731
16
Frontage Road at Kerawalapitiya
1.4
6
Frontage Road at Mattumagala
1.25
6
Total
16.807

Total Cost : US$ 520.039 Mn

Total Cost Includes;

  • 6 Lane embankment width for a length of 3.42 km
  • 6 Lane Viaduct substructure width for a length of 5.9 km
  • 4 Lane expressway carriageway for a length of 9.32 km
  • Construction of Bridges, Overpasses and under passes where the total is 7 Nos.
  • Construction of Box and Pipe Culverts where the total is 30 Nos.
  • Soft ground treatment at entire Kerawalapitiya Interchange area and 400m at Kadawatha.
  • Right of way fence for a length of 21.9 km
  • Guardrails for road sides for a length of 4.8 km
  • Providing traffic signs and direction boards.
  • Electronic Toll System
  • Road lighting for entire road length
  • Construction of Toll booths and Toll Plazas
  • Landscaping and planting trees.

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Last Modified Date : 18-Dec-2014