(literaly whisper asphalt)
@DucatiKiller has already given a nice answer about a concrete version of this, however, this is really asphalt and is also processed more or less like standard asphalt (Lots of heat etc.).
The one and only reason why this is used here in Germany is to reduce the noise of the wheels on the road, and it really makes a big difference, even on a dry road. It seems there's no noise from the wheels any more.
Cars make even more noise on a road with water on it, but this is completely swallowed, too.
Of course, having no water on the road is safer, too: Better visibility (see your pics) and more grip.
That point of @DucatiKillers answer about cars with worn tires was never discussed here.
The draw back of Flüsterasphalt is that the pores will clog up over time with dirt and rubbed-off material from the wheels, so the noise reduction effect doesn't last very long. Another point is that water enters the asphalt and can break it up when it freezes.
It's said that Flüsterasphalt lasts for about 8 years, while standard asphalt lasts up to 20 years.
Near cologne, they used this asphalt a couple of years ago, but next year, they already have to exchange it...
Ah, and by the way: Some cities like mine now start to use it on big roads in the center of the city. But at the low speed limit there, noise of the wheel usually isn't an issue...