SMART Tunnel

The Kilometre Zero of the tunnel is located at Salak Interchange.^{[citation needed]}

In 2001 the Government sought proposals for a solution that would allow a typical flood of three to six hours' duration to occur without flooding the city centre.^[1] A tunnel that would allow floods to bypass the centre was one way of achieving this, providing it was coupled with temporary storage facilities to keep flows downstream of Kuala Lumpur within the capacity of the river channel. A group led by Gamuda engaged SSP, a large Malaysian consultant engineering firm, and Mott MacDonald UK to develop proposals for a tunnel with holding ponds at upstream and downstream ends of the tunnel.^{[citation needed]}

Construction of the tunnel began on 25 November 2003. Two Herrenknecht Tunnel Boring Machines (TBM) from Germany were used, including Tuah on north side and Gemilang on south side. Gusztáv Klados was the senior project manager of the project.^[2]

On 11 December 2003, the 13.2-m diameter Mixshield TBM, Tuah, completed a 737-m section after 24 weeks of excavation. By the end of January 2004, Tuah would start a second drive covering a distance of 4.5 km to Kampung Berembang lake. The motorway sections on the SMART system was officially opened at 3:00PM, 14 May 2007, after multiple delays.^[3][4]

Meanwhile, the stormwater sections on the SMART system began operations at the end of January 2007.^{[citation needed]}

By 18 July 2010 the SMART system had prevented seven potentially disastrous flash floods in the city centre,^[5] having entered its first mode 3 operation only weeks after the opening of the motorway.^[6]

As of September 2020, the tunnel had activated its fourth mode for the seventh time. During the flash flood on 10 September 2020, the tunnel diverted three million cubic metres of water.^[7][8]

In December 2021, SMART entered Mode 4 for an eighth time, due to the massive flooding caused by heavy rainfall lasting from 16 to 18 December. The tunnel was again activated and spared the center of Kuala Lumpur from a potentially catastrophic flood, having successfully diverted 5 million cubic metres of flood water during the 22 hours it was on full activation.^[9]

In 2022, the government was considering the proposal to build another tunnel, briefly known as SMART 2, to cater for high density flood-prone area such as Shah Alam.^[10]

The first mode, under normal conditions where there is no storm, no flood water will be diverted into the system. When the second mode is activated, flood water is diverted into the bypass tunnel underneath the motorway tunnel. The motorway section is still open to traffic at this stage. When the third mode is in operation, the motorway will be closed to all traffic. After making sure all vehicles have exited the motorway, automated water-tight gates will be opened to allow flood waters to pass through. After the flood has ended, the tunnel is verified and cleaned via pressure-washing, and the motorway will be reopened to traffic within 48 hours of closure.^[11]

• World's first dual-function tunnel (stormwater management & road)
• Longest tunnel in Malaysia
• 9.7 km (6.03 miles) stormwater by-pass tunnel
• 4 km (2.49 miles) double-deck motorway within stormwater tunnel
• The motorway tunnel is suitable for light vehicles only. Motorcycles and heavy vehicles are not allowed
• Ingress and egress connections to the motorway tunnel linking the southern gateway to the city centre
• Holding basin complete with diversion and tunnel intake structures
• Storage reservoir and a twin-box culvert to release flood discharge
• State-of-the-art operations control room equipped with the latest systems in operations management, surveillance and maintenance of the SMART system.
• Custom-made fire engine units consisting of two modified Toyota Hilux pickup trucks, parked at two different locations for quick access to the tunnel in case of fire on both carriageways.^[12]

The SMART Tunnel utilizes an open toll system. Ever since its operation, all toll transactions at this toll plaza are carried out using Touch 'n Go cards, MyRFIDs or SmartTAGs. Cash payments are not accepted.

The entire expressway had its speed limit of 60 km/h, maximum height 2 m and located in Federal Territory of Kuala Lumpur.

Legend:

• I/C - Interchange, I/S - Intersection, RSA - Rest and service area, OBR - Overhead bridge restaurant, R/R - Restaurant and rest plaza, L/B - Layby, V/P - Vista point, TN - tunnel, T/P - Toll plaza, BR - Bridge

• C - Cloverleaf, S - Stack, T-A - Trumpet-A, T-B - Trumpet-B, DT - Directional-T/Y, SDT - Semi-Directional-T/Y, P-Y - Partial-Y, D - Diamond, P-C - Partial cloverleaf, D-D - Diverging diamond, D-R - Direct ramp

More information km, Exit ...

km	Exit	Sections	Name	Destinations	Notes
Through to Kuala Lumpur–Seremban Expressway
0.0	–	Dry	–
	T/P		SMART toll plaza	Touch 'n Go SmartTAG
	3801		Motorway Tunnel Tunnel exit south bound	3801A SMART Tunnel Operation Office East–West Link Expressway – Cheras, Petaling Jaya, Shah Alam 3801B Kuala Lumpur–Seremban Expressway – KL Sports City, Klang North–South Expressway Southern Route / AH2 – Kuala Lumpur International Airport (KLIA), Seremban, Malacca, Johor Bahru	Tunnel Interchange
		Wet	Motorway Tunnel Wet sections
	3802	Dry	Motorway Tunnel Tunnel exit north bound	3802A Sultan Ismail Link Tunnel (Jalan Davis-Kuala Lumpur Inner Ring Road) – Jalan Imbi, Jalan Sultan Ismail, Jalan Bukit Bintang 3802B Kuala Lumpur Middle Ring Road 1-Jalan Tun Razak (Jalan Pekeliling) – Kuala Lumpur City Centre (KLCC), Ampang	Tunnel Interchange Lower floor
Through to Kuala Lumpur Middle Ring Road 1

Close

The tunnel was featured in the below series:

• Season 4, Episode 2, of Extreme Engineering, titled "MegaTunnel", on the Discovery Channel.
• An episode of Truly Malaysia on the National Geographic Channel and TV1.
• Season 2, Episode 3, of Man Made Marvels, titled "Kuala Lumpur: Flood Control", on the Science Channel.
• Season 4, Episode 2, of Megastructures on the National Geographic Channel and TV1.
• Season 1, Episode 2 of Build It Bigger on the Science Channel.
• The tunnel is also featured in the 2nd film of Ejen Ali.

• List of long tunnels by type