The SMART Tunnel is a 9.7 km stormwater drainage and road tunnel in Kuala Lumpur, Malaysia that was constructed to solve flooding issues and reduce traffic. It includes a 13.2 meter diameter stormwater tunnel and a 4 km double-deck motorway tunnel that allows floodwater diversion. The tunnel was constructed between 2003-2007 using tunnel boring machines and provides flood relief for Kuala Lumpur.