Self cleaning street - photo

[Jon]

Self cleaning street in South Korea. Anyone know what's going on here? Why is this needed to supplement rain? Cooling?



Previously:

Chinese street surveillance software - video
Snowplowing a street without blocking driveways - GIF

[jeongyun]

That's for cooling.
The city of Daegu, South Korea is surrounded by mountains and because of that it suffers from severe urban heat island effect a lot.
So they implemented what you see in that photo.