Good news, Malaysians! The Stormwater Management And Road Tunnel or SMART tunnel has been listed as one of the 10 greatest tunnels in the world, according to CNN. This adds to the tunnel’s earlier recognition by the United Nations, where it received the Habitat Scroll of Honour Award in 2011 for its innovative and unique management of storm water and peak hour traffic.

As a bit of a recap, the SMART project was completed in 2007, and serves as both a flood relief tunnel and motorway. The former features a storm water tunnel that measures 9.7 km in length while the motorway tunnel length is 4 km.

The tunnel was built to solve the problem of flash flooding in Kuala Lumpur, and is expected to prevent billions of ringgit of possible flood damage and costs from traffic congestion. The article states that since it opened, “flood-prone areas such as Masjid Jamek, Dataran Merdeka, Leboh Ampang and Jalan Melaka have been spared from floods.”

It then goes on to detail the various operation modes available: when there’s no flooding, it serves purely as a road tunnel but when there are floods, rainwater can be diverted into a lower channel, with the upper level will remain open to traffic.

However, when exceptionally heavy floods occur, the tunnel is closed to all traffic and watertight gates open to allow floodwater to flow through both the upper and lower channels. If you would like a trip down memory lane with the SMART tunnel, this documentary by National Geographic should be worth an hour and 16 minutes of your day.

Joining the SMART tunnel on the top 10 list are are the Gotthard Base Tunnel in Switzerland, the Channel Tunnel which links the UK and France, Eisenhower Tunnel in the USA, the Spiralen Tunnel and the Laerdal Tunnel, both in Norway, China’s Guoliang Tunnel in Henan Province and Bund Sightseeing Tunnel in Shanghai, Japan’s Seikan Tunnel and the Tokyo Bay Aqua-Line.