[QUOTE=Mr. Hairy Legs;16654066]You guys are merciless.QUOTE]
Here frightening laughter must be. Yes, of course. I think If I had told you where i'm from, you would have been sure in it.

Apparently we didn't understand each other. I've wanted to say by my post, that airzound is not enought useful, because, for example in this video, it's not gives the result.
Result for me is safe traffic. To be honest, biker had better to THINK HIMSELF about his next actions. If he hopes for some breeeeng maker, he will spend such a valuable seconds. This makes situation is more dangerous than even was before.
Thus, I can't say it's absolutely useless. I've wanted it sometimes and I'm sure that will want many times more in future.

But would I say that it is required for each? Well, I don't know, because I join in this thread.