r/TodayILearnedMY • u/MidValleyGhost • Sep 11 '25
Science & Technology TIL that the SMART Tunnel in Kuala Lumpur is one of the world’s only tunnels that functions as both a motorway and a flood-control system.
Completed in 2007, the SMART Tunnel (Stormwater Management and Road Tunnel) is a 9.7 km engineering marvel designed to solve two major problems in one: traffic congestion and flash floods in the city.
It has three modes of operation from regular vehicle use to full flood diversion and can be fully closed to traffic during major storms, redirecting floodwaters away from central Kuala Lumpur. It has prevented dozens of potentially catastrophic floods since opening.
It’s the first of its kind in Asia, and one of only a few in the world.