In urban traffic the only information a horn conveys is that someone, somewhere, is using one… Which car was honking? Who is the driver honking at? Me? Another road user? A pedestrian? Is he warning someone? Trying to attract attention? Saying hello to a friend? It is usually a complete mystery.
Of course, what it really means is that somebody is cross - and in my experience, usually, that the person behind me at a junction thinks I am being too slow in driving into said junction. Which really frustrates me, as from a car’s length further back he can’t see the reason that I have not done so yet: there is a car coming, you douche, do you want me to rush out and slam into it just because you are an impatient idiot?
