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SMART is an acronym for Stormwater Management and Road Tunnel, a project launched by the Federal Government to help relieve flooding in Kuala Lumpur's city center. The project is being carried out through a collaboration agreement between MMC Corp Berhad and Gamuda Berhad, with the Department of Irrigation and Drainage Malaysia and the Malaysian Highway Authority representing as the project's executing government agencies.

Using a holding pond, bypass tunnel, and storage reservoir, the SMART system will be able to divert large amounts of flood water away from this critical stretch. This will lower the flood level at the Jalan Tun Perak Bridge and prevent spillover.

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The SMART tunnel works on a four-mode system. The first mode is used in normal conditions, such as when there is little rain and no storm. The highway section will remain open to traffic. In the event of a moderate storm, the SMART system is activated, and floodwater is diverted into the bypass tunnel in the lower channel of the motorway tunnel. The upper channel will remain open to traffic. When a major storm hits, the third mode is activated, and the tunnel is closed to traffic. When all vehicles have exited the tunnel, automatic water-tight gates open, allowing floodwater to pass through.

If a heavy rainstorm persists after one to two hours of activation of the third mode, the final mode is activated. Following the complete evacuation of traffic, the tunnel will be used for flood passage in this mode. The road tunnel will be shut down for four days.

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The Malaysian smart tunnel's greatest advantage is that it helps to make the city more resilient. SDG 11 (Sustainable Cities and Communities) includes smart urban infrastructures as a feature that will be expanded to combat climate change.

Climate change has increased the frequency and intensity of major storms in Malaysia. A road infrastructure that doubles as a road and a storm tank offers a lot of flexibility.

In fact, part of the future urban 'intelligence' will come from an increase in the flexibility of use of existing infrastructures, as is the case with so-called 'mixed-use buildings.

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The dual use system is not the only way to build a smart tunnel, but it is one of the most practical and durable. Along with the SMART tunnel, some of the most intriguing designs are:

The Cereixal tunnel (Spain) is characterized by its vehicle-to-grid (V2G) and 5G technology connections. It allows for better infrastructure management.

One of the most highly optimized tunnels is the Gotthard Base Tunnel in Switzerland. It connects Bodio and Erstfeld by cutting through the Alps, with hundreds of trains passing through each day.

The tunnel of Markovec (Slovenia). It maximizes security by including hundreds of sensors and more than 90 cameras.

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The problem for it solves (stormwater diverting) would not have been necessary if Kuala Lumpur had implemented an urban planning model to prevent water channels decades ago.

The second criticism arise from the conversion of the two rivers (Sungai Klang and Kerayong). Ecologists contend that a river is an ecosystem, not a pipeline. The constant diversion of stormwater has had a significant impact on water biodiversity and the area in general.

The more vehicles are using the tunnel ,because travel times have been reduced, . It soon stopped reducing traffic jams because there was more traffic, . A trap that other approaches fall into.