SLOW CHILDREN PLAYING

That, my dear setanta, is not made clear by the signage.

It looks to me like that guy is being pursued by fast dust . . . is he likely aware of this? Is this some insidious characteristic of slow dust? That it turns into fast dust and sneaks up on you?

You live in a very scary place . . .

Not as scary as this place.
http://www.break.com/index/driving-through-a-massive-dust-storm.html