Klaxon camion is French for truck horn, and this clip captures the deep air horn fitted to large lorries and buses. Unlike a car horn, an air horn uses compressed air to produce a much louder, lower blast that is designed to be heard over motorway noise and in poor visibility. Soundboard users have long collected vehicle horns for pranks and edits, and this short, clean blast works well because it needs no context. It still appears in memes, reaction videos and short-form edits whenever a creator wants an instant, unmistakable warning sound.