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Why not on foot? you're not meant to walk along the road through the cars
You can do it: that's what Ingo said that he did
Now that you mention that, you're not supposed to honk inside of a city in Spain, it's forbbiden, but as you very well say peopl still do it even if not "legal"
Rough summary from our "code de la route" : in Belgium they must be as short as possible and can be used only to warn others from a danger or prevent accident (i.e. not to be used to call a friend, or in a traffic jam). Outside the city they can also be used to notify someone that you will pass him (what is funny is that for this purpose it is not much used
)In the night it must be replaced by the switch on/off of the "big headlights".