What the - Chemical Warfare II?!

This should be viewed as an addendum to Flint's post...

You should be able to see an orange and blue contraption at the side of the road. It's hooked up to the big blue tank on the right. The orange part is a fan, and it is blowing chemicals onto the road (and every car that passes by) from the tank. There is another one on the other side of the road, so every vehicle that enters or leaves Oksan is pretty well slathered over.
My director explained to me that this is some kind of disinfectant designed to combat the spread of hoof-and-mouth disease, which has broken out in Korea.
The fans have been there blowing away every time I have gone to work, so I imagine they've been going 24/7 ever since Monday.
It rained on Monday and Wednesday, and pretty good, too. I can only imagine the "effectiveness" of these chemicals in a steady rainfall.
Coming into town on Tuesday, I had the windows rolled down, and only managed to get them up just in time. I had to slow down a bit (who knows what those chemicals are), and the mookish motorist behind me was in a bit of a hurry. He beeped his horn, and I... gestured.... that I would only be "one minute" (I think I used the right finger to convey my meaning).
But I wonder how many fans are blowing in how many other towns? I wonder who has to set up these... uh... blow jobs?