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Annual review 2022

The North-South Corridor will include continuous bus lanes as well as cycle and pedestrian paths, making transport healthier, safer and more inclusive. Here, site workers cast the roof slab on the N107 tunnel section of the corridor.

A new dual-layered transport corridor for Singapore


The multibillion-dollar construction of a dual-layered transport corridor across the island, including a 12.5km tunnel, has challenged our engineers like few other projects – but we are coming through with ingenious solutions that break new ground in more ways than one


Singapore’s North-South Corridor


GS Engineering and Construction Corp, Penta-Ocean Construction Co and Bachy Soletanche JV, Samsung C&T Corp, Ssangyong–Wai Fong JV




Full detailed design including bridges, civil and structural, construction support, geotechnics, mechanical, electrical and plumbing, traffic, tunnelling, underground utilities and viaducts

Project owner

Land Transport Authority

Project value


The 21.5km corridor will relieve congestion through a mix of tunnel and elevated viaduct, while providing dedicated bus lanes, cycling and pedestrian paths at the street-level. Its first 12.5km route comprises a stacked box tunnel that dives beneath the majestic modern skyscrapers and traditional street markets in the central business district (CBD). Emerging north of the city centre, vehicles will continue their journey at surface level before the route transitions into 9km of elevated viaduct.

World leading innovation on a transit project

Challenging ground conditions and proximity to existing structures have made our team’s decades of expertise invaluable in finding innovative solutions on the North-South Corridor (NSC) project. A dual-layered transport corridor, it is planned to run from residential areas in the north of Singapore into the city centre.