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North–South Corridor, Singapore

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Future expressway and cycling path in Singapore Not to be confused with North–South MRT line.

North–South Corridor
Koridor Utara-Selatan (Malay)
南北交通廊道 (Chinese)
வடக்கு-தெற்கு போக்குவரத்து நெடும்பாதை (Tamil)
North–South Corridor is labelled in single violet line
Route information
Length21.5 km (13.4 mi)
HistoryConstruction began in 2018, viaduct completion in 2027 (estimated), tunnel completion in 2029 (estimated)
Major junctions
North endAdmiralty Road West
Major intersectionsSLE, PIE, CTE, ECP
South endECP, Republic Avenue and Nicoll Highway
Location
CountrySingapore
Highway system

The North–South Corridor (NSC), originally conceptualised as the North-South Expressway (NSE), is an under-construction expressway that will be the 11th of Singapore's network of expressways when completed. The North South Corridor will serve increasing traffic along the north-south corridor that is currently served by the Central Expressway (CTE). The 21.5 kilometres (13.4 mi) expressway is expected to cost about S$7.47 billion when fully completed in 2029 as North-South Corridor and will connect the East Coast Parkway (ECP) with the northern parts of Singapore.

The NSC will have a total of 16 entrances and 17 exits to connect towns along the north-south corridor—Woodlands, Sembawang, Yishun, Ang Mo Kio, Bishan and Toa Payoh—with the city centre. The NSC will also provide links to existing expressways, including the Seletar Expressway (SLE), Pan-Island Expressway (PIE) and East Coast Parkway (ECP).

The NSC will be Singapore's first expressway conceived as an "integrated transport corridor", featuring dedicated bus lanes and cycling trunk routes integrated with a traditional expressway. The NSC Expressway (previously conceived as the NSE) consists of an 8.8 km (5.5 mi) viaduct in the north running from Admiralty Road West to Lentor Avenue, a 0.4 km (0.25 mi) at-grade section at Lentor Avenue, and a 12.3 km (7.6 mi) underground tunnel portion that runs until East Coast Parkway. Additionally, the surface streets that run along the underground tunnel of the NSC will see road lanes reprioritised for walking, cycling, public transport and community spaces.

According to the Land Transport Authority (LTA), the continuous bus lanes along the NSC will be able to reduce bus travelling times from Woodlands, Sembawang, Yishun and Ang Mo Kio to the city by up to 30 minutes through morning and evening peak express bus services, and also make bus connections between residential towns along the NSC faster by allowing intra-town buses to leverage the ramps and bus lanes on the surface. A cycling path along the entire stretch of the highway will link up the Park Connector Networks and dedicated cycling path networks within HDB towns along the entire corridor to the city centre.

When first conceptualised in 2011, the NSE was initially targeted to be ready by 2020. In January 2016, the NSE was then reconfigured to instead be part of the NSC, with a new completion date of 2026 set for the NSC. However, due to significant delays in construction, the deadline has been pushed back multiple times. It is now expected for the viaduct (at the northern terminus of the expressway) to be opened in 2027, and the underground tunnels (at the southern terminus of the expressway) to be opened in 2029.

History

Plans

On 30 January 2008, the expressway was first announced by then Minister for Transport Raymond Lim as the North-South Expressway (NSE), as part of a major review of Singapore's transport network by the Land Transport Authority (LTA). It was then expected that the NSE would be completed by 2020, and would reduce travel time to the city for residents in the north by up to 30%

On 19 January 2011, the government gave the go-ahead for the alignment of the northern section consisting of viaducts, surface and tunnel from Admiralty Road West to Toa Payoh Rise, which is expected to complete in 2020, construction is expected to start in 2013 with the easiest acquisition. On 15 November 2011, the government gave the go-ahead for the alignment of southern section consisting of the full tunnel to ECP, and the construction was further delayed, to "after the demolition of Rochor Centre" in 2017 and construction is expected to begin in 2018 for completion in 2025, then subsequently delayed to 2026 during the groundbreaking ceremony of North-South Corridor and further delayed to 2028 due to COVID-19 pandemic. Then Minister for Transport Khaw Boon Wan outlined the ministry's plans to reconfigure the NSE as part of the North-South Corridor (NSC), an integrated transport corridor with one lane out of the three-lane highway to be dedicated for express bus services, as well as to have cycling and pedestrian paths that run along the NSC.

Land acquisitions and demolitions

The North-South Corridor entails the acquisition of Marymount Terrace terraced houses and Rochor Centre in the initial phase. Terraced houses were the easiest to move, HDB flats requires the construction of the replacement which is due to the construction delays for North-South Corridor. A total of 567 flats and 187 rental shops and eating houses were vacated by 31 December 2016. The four blocks of HDB flats eventually began demolition on 26 June 2018, and was targeted to finish by April 2019.

In August 2016, several units in the Ellison Building which was built in 1924, was considered for partial demolition and reconstruction after the completion of the NSC, despite its previous conservation gazette in 2008 by the URA. This sparked concerns from several heritage groups in Singapore including the Singapore Heritage Society and International Council on Monuments and Sites (Singapore), slamming the decision to reconstruct as it would be equivalent to the "falsification of historical artefacts", while also bringing the efficacy of conservation gazettes into question. The URA then came up with a revised plan in February 2018 to instead demolish and reconstruct part of the façade of only one unit, compared to the original plan of demolishing and reconstructing three full units in the building.

In April 2021, another four-storey building along Thomson Road, comprising 12 residential units and 4 shops, was acquired to make way for construction of the NSC. Unit owners were initially instructed to vacate the premises temporarily for a period of two years until excavation works were completed for safety reasons, but it was found that the building's concrete strength was lower than safely required in order to withstand excavation works for the tunnel beneath the building, and thus was instead chosen to be acquired and demolished. This sparked some unhappiness with the unit owners who were looking forward to a collective sale on the open market, since the proceeds were expected to be higher than the compensation that they would have received from the land acquisition.

Construction

Construction of the North-South Corridor at Rochor in April 2024

The first contract for the NSC was awarded in November 2017, which expected the construction for the section of the tunnel between Toa Payoh Rise and Novena Rise to commence in 2018. Several other contracts were also awarded for the construction of various sections of the underground tunnel throughout the whole of 2018 to January 2019.

The contracts for the viaduct portion of the NSC were awarded later, with three contracts awarded in December 2019, with works expecting to begin in early 2020.

On 1 July 2023, it was announced that the NSC will be completed in two phases instead, starting with the viaduct segment which would be completed by the previous expected completion date of 2027, followed by the underground tunnel segment which would be delayed by another two years and completed by 2029 instead. Reasons cited for the delay include the COVID-19 pandemic along with challenging soil conditions.

On 17 September 2023, an accident occurred resulting in the death of a 41-year-old construction worker at the worksite of Cavenagh Road when a pallet of gas cylinders toppled.

Impact during construction

In order to support the construction of the North-South Corridor, several roads were temporarily rerouted or diverted during the process:

  • With the demolition of the underpasses around the Novena area, it was announced that the major traffic junction at Novena linking Newton Road, Moulmein Road and Thomson Road, will be adjusted to make way for the construction of expressway tunnels.
  • On 30 March 2023, it was announced that a traffic junction between Marymount Road, Sin Ming Avenue and Bishan Street 22 would be converted into a signalised roundabout temporarily to speed up construction on the underground road tunnel beneath the junction from 30 April 2023 until Q2 2024.
  • On 4 October 2023, it was announced that Marymount Flyover will be temporarily closed for construction works for the North-South Corridor starting 8 October 2023 until 2029.

During the construction, noise complaints were received by the LTA that construction works did not adhere to requirements to cease after 10pm and during weekends. In response, the LTA mentioned that there may be exceptions to the stoppage requirement in the case of "safety critical works". In addition, more noise barriers were deployed in the Novena area following the complaint.

Route

Based on the plans released by LTA as of the NSE alignment released in November 2011, the route that the 21.5 km (13.4 mi) NSC expressway will take is as follows:

  • Viaduct: 8.8 km (5.5 mi) running from Admiralty Road West to Lentor Avenue/SLE
    • The northern terminus of the NSC commences at Admiralty Road West, and runs southwards along Woodlands Avenue 8/Gambas Avenue/Sembawang Road, before joining Lentor Avenue.
    • The portion of the viaduct that runs along Lentor Avenue is also expected to run parallel to the North–South MRT line.
  • At-grade: 0.4 km (0.25 mi) intersecting at Lentor Avenue/SLE
    • Three off-ramps are planned, with two off-ramps going north/south-wards along Lentor Avenue, and one off-ramp going westwards towards SLE/BKE.
    • One on-ramp is planned from the SLE traveling westwards to join NSC towards the north.
  • Tunnel: 12.3 km (7.6 mi) running from Lentor Avenue/SLE to ECP, Republic Avenue, Nicoll Highway
    • The underground tunnel starts at Lentor Avenue/SLE and runs southwards along Ang Mo Kio Avenue 6/Marymount Road, passing Toa Payoh Rise, before joining Thomson Road and Bukit Timah Road running parallel to the Central Expressway, continuing along Ophir Road, before joining ECP, Republic Avenue, and Nicoll Highway at its southern terminus of the NSC.
    • On Marymount Road, the tunnel will be integrated with the MRT station box for the Teck Ghee station on the upcoming Cross Island MRT line.
    • One on-ramp is planned from the PIE traveling eastwards to join NSC towards the south, as well as one off-ramp going northwards to join the PIE traveling westwards.

Planned entrances and exits

Location Destinations Notes
Sembawang Admiralty Road West Northern terminus
Woodlands Avenue 8 Northbound exit only
Gambas Avenue and Woodlands Avenue 12 Northbound exit and southbound entrance only
Yishun Sembawang Road Northbound exit and southbound entrance only
Sembawang Road, Yishun Avenue 1 and Mandai Avenue Southbound entrance only
Ang Mo Kio SLE
Lentor Avenue (southbound)
SLE and BKE
Lentor Avenue (northbound) 		Southbound and northbound exits
Northbound entrance from SLE only
Ang Mo Kio Avenue 6 Northbound entrance only
Bishan Marymount Road
Toa Payoh Thomson Road Northbound exit and southbound entrance only
Novena PIE (Tuas) Northbound exit and southbound entrance only
Kallang Kampong Java Road, Bukit Timah Road and CTE (southbound)

Bukit Timah Road and CTE (northbound) ||

Downtown Core Ophir Road Southbound exit and northbound entrance only, latter from Rochor Road
Nicoll Highway Northbound entrance only
ECP
Republic Avenue and Republic Boulevard		 Southern terminus

References

  1. ^ "Road tunnel portion of North-South Corridor delayed by two years to 2029". The Straits Times. 3 July 2023. Archived from the original on 29 July 2023. Retrieved 11 September 2023.
  2. ^ "SPEECH BY MR RAYMOND LIM,MINISTER FOR TRANSPORT, AT VISIT TO KALLANG-PAYA LEBAR EXPRESSWAY, 30 JANUARY 2008, 10.15 AM". www.nas.gov.sg. Archived from the original on 6 December 2022. Retrieved 6 December 2022.
  3. "Full alignment of the North-South Expressway unveiled" (Press release). Land Transport Authority. 15 November 2011. Archived from the original on 30 December 2013.
  4. ^ Lim, Adrian (28 April 2016). "North-South integrated transport corridor expected to be completed around 2026: LTA". The Straits Times. Archived from the original on 23 June 2017. Retrieved 9 June 2017.
  5. ^ "Full Alignment of North-South Expressway Unveiled". Land Transport Authority. 15 November 2011. Archived from the original on 5 March 2016. Retrieved 11 August 2019.
  6. "Joint Release by the Land Transport Authority (LTA) & NParks - Transforming North-South Corridor: Co-Creating Community Spaces for Greener Travel" (Press release). Land Transport Authority. 29 July 2023. Archived from the original on 26 November 2023. Retrieved 12 December 2023.
  7. ^ Lim, Adrian (21 January 2016). "North-South Expressway to have express bus lanes, cycling route; 85% to use public transport as main travel mode by 2050s". The Straits Times. Archived from the original on 11 December 2023. Retrieved 11 December 2023.
  8. "LTA to Call Tenders for the North-South Corridor | Press Room | Land Transport Authority". www.lta.gov.sg. Archived from the original on 21 March 2017. Retrieved 9 June 2017.
  9. ^ "MOT's Addendum to the President's Address" (Press release). Ministry of Transport. 21 January 2016. Archived from the original on 12 December 2023. Retrieved 12 December 2023.
  10. "Government Gives Go-Ahead for Alignment of Northern Segment of North-South Expressway (NSE)". Singapore Land Authority. 19 January 2011. Archived from the original on 11 December 2023. Retrieved 12 December 2023.
  11. "North-South Expressway construction will only start in 2016: Lui". Channel NewsAsia. 21 January 2015. Archived from the original on 2 April 2015. Retrieved 7 March 2015.
  12. Lim, Adrian (12 April 2017). "Start of works for North-South Corridor delayed to 2018". The Straits Times. Archived from the original on 11 December 2023. Retrieved 11 December 2023.
  13. ^ Abdullah, Ahmad Zhaki (16 April 2021). "Government acquires 4-storey Thomson Road building to make way for North-South Corridor constructionAhmad Zhaki Abdullah". CNA. Archived from the original on 11 December 2023. Retrieved 11 December 2023.
  14. Hetty Musfirah (15 November 2011). "New expressway sparks big land acquisition". Channel NewsAsia. Archived from the original on 16 November 2011. Retrieved 16 November 2011.
  15. Chia, Rachel; Teo, Dominic (31 March 2016). "Long-time residents bid goodbye to Rochor Centre: 'Each neighbour is worth a million bucks'". The Straits Times. Retrieved 11 December 2023.
  16. Chia, Rachel; Teo, Dominic (31 March 2016). "Counting down to the end of Rochor Centre". The Straits Times. Archived from the original on 4 April 2016. Retrieved 1 April 2016.
  17. Ng, Charmaine (20 June 2018). "Demolition of Rochor Centre to begin on June 26 in preparation for North-South Corridor: LTA". The Straits Times. Archived from the original on 11 December 2023. Retrieved 11 December 2023.
  18. Zaccheus, Melody (18 August 2016). "North-South Corridor tunnel works to affect Ellison Building". The Straits Times. Archived from the original on 12 December 2023. Retrieved 12 December 2023.
  19. Zaccheus, Melody (18 August 2016). "Tunnel works to affect heritage building". AsiaOne. Retrieved 12 December 2023.
  20. Zaccheus, Melody (2 September 2016). "Council of heritage practitioners slams decision to demolish and reconstruct historic Ellison Building". The Straits Times. Retrieved 12 December 2023.
  21. Zaccheus, Melody (19 October 2016). "LTA and URA reviewing plans to tear down part of historic Ellison Building". The Straits Times. Archived from the original on 27 October 2022. Retrieved 12 December 2023.
  22. "Maximising retention of corner unit of Ellison Building affected by the construction of the North-South Corridor" (Press release). Urban Redevelopment Authority. 13 February 2018. Archived from the original on 12 December 2023. Retrieved 12 December 2023.
  23. Zaccheus, Melody (13 February 2018). "A larger part of Ellison Building likely to be saved from demolition and reconstruction". The Straits Times. Archived from the original on 27 February 2024. Retrieved 11 December 2023.
  24. Kok, Yufeng (17 April 2021). "Thomson Road building to be demolished: Owners of residential units stunned". The Straits Times. Retrieved 12 December 2023.
  25. "LTA Awards First Contract for North-South Corridor". Land Transport Authority. 24 November 2017. Archived from the original on 14 July 2021. Retrieved 14 July 2021.
  26. Tan, Christopher (24 November 2017). "South Korean firm lands first civil contract for new expressway here". The Straits Times. Retrieved 14 July 2021.
  27. Lim, Adrian (21 December 2018). "LTA awards six more contracts worth $3.14 billion for construction of North-South Corridor". The Straits Times. Retrieved 11 December 2023.
  28. "LTA Awards $954.1 million in Contracts for the Construction of North-South Corridor Viaduct" (Press release). Land Transport Authority. 16 December 2019. Archived from the original on 15 July 2021. Retrieved 15 July 2021.
  29. "Written Reply to Parliamentary Question on Impact of Covid-19 Disruptions on Completion Date of North-South Corridor". Ministry of Transport. Archived from the original on 11 December 2023. Retrieved 11 December 2023.
  30. Devaraj, Samuel (17 September 2023). "Man dies after accident at North-South Corridor worksite in Cavenagh Road". The Straits Times. Archived from the original on 11 December 2023. Retrieved 11 December 2023.
  31. Yong, Clement; Toh, Ting Wei (5 October 2020). "Changes to major junction in Novena due to expressway works". The Straits Times. Archived from the original on 6 October 2020. Retrieved 5 October 2020.
  32. Kok, Yufeng (17 April 2023). "Marymount junction to be turned into roundabout to expedite North-South Corridor works". The Straits Times. Archived from the original on 11 December 2023. Retrieved 11 December 2023.
  33. Loi, Esther (4 October 2023). "Marymount Flyover to be shut from Oct 8 for construction of North-South Corridor". The Straits Times. ISSN 0585-3923. Retrieved 5 October 2023.
  34. "More noise barriers installed following resident's feedback" (Press release). Land Transport Authority. 7 June 2023. Archived from the original on 12 December 2023. Retrieved 12 December 2023.
  35. "NSErampsrev2-1.ppt" (PDF). Land Transport Authority. Archived from the original (PDF) on 16 February 2018. Retrieved 12 December 2023.
  36. "$615.9 million contract awarded for North-South Corridor, Transport News & Top Stories - the Straits Times". 30 January 2019. Archived from the original on 30 December 2019. Retrieved 30 December 2019.
  37. "Annex A - NSC Viaduct Ramps.pdf" (PDF). Land Transport Authority. Archived (PDF) from the original on 20 July 2024. Retrieved 20 July 2024.
  38. "Annex B - NSC Tunnel Ramps.pdf" (PDF). Land Transport Authority. Archived (PDF) from the original on 20 July 2024. Retrieved 20 July 2024.

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