The Kallang–Paya Lebar Expressway (KPE) is the third newest of Singapore's network of expressways. The southern (Kallang) section of the expressway opened first, on 26 October 2007, with the remaining (Paya Lebar) section opened on 20 September 2008. Connecting East Coast Parkway (ECP) in the south and Tampines Expressway (TPE) in the north-east, the six-lane (2x3) expressway extends for twelve kilometres, with approximately of main cut and cover tunnels running some 10 kilometres underground when fully completed. Built at a cost of approximately S$1.8 billion (USD$1 billion), it is the longest subterranean road tunnel in Southeast Asia. The KPE is also believed to be the world's sixth longest underground road project at its time under construction. In all, the dual-carriageway expressway with three lanes in each direction will have eight interchanges, eleven on-ramps, and twelve off-ramps. The south end of the KPE also connects directly to the Marina Coastal Expressway which opened on 29 December 2013. The Land Transport Authority (LTA) has awarded a contract for the expansion of the KPE/TPE interchange at the north end of the expressway and construction of a new road connection to Punggol Central, providing a new and more direct link to and from the KPE and TPE, and alleviating the traffic congestion of the TPE between the current KPE ramps and Punggol ramps. The work would involves the design and construction of roads, three new vehicular bridges crossing Sungei Serangoon and Sungei Blukar, a new flyover across TPE and other associated ramps. Construction works commenced in the second quarter of 2015. History A 2.8 km-long Kallang Expressway (KLE) was envisioned as early as 1981, serving as a link between the Pan Island Expressway (PIE) and East Coast Parkway (ECP). It would have become the shortest expressway in Singapore if it was built. The modern Kallang–Paya Lebar Expressway (KPE) was first conceptualised in the preliminary plans of 1997, merging the KLE and the Paya Lebar Expressway (PLE) into a single expressway. Construction on KPE started in the year 2001, and was fully completed in 2008. On 23 June 2007, the northern end of the expressway between Tampines Road from the new Defu Flyover and the Tampines Expressway was opened to traffic, and was temporarily named Tampines Service Road. Tampines Road will therefore no longer connect with the Tampines Expressway at the Tampines Flyover. The Defu Flyover along Tampines Road, along with the traffic signals, were