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.
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