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Here are some of my a favorite honks:
A Mercedes truck sounds like an elephant that stubbed its toe. A short quick elephant honk. Mac trucks sound the exact same, and yes if you pull your arm up and down to signal for a honk from a Mac truck, they will honk (apparently it is a universal symbol). You also have your clown nose honks. These honks typically come from the smaller older vehicles. That's really all I can think of right now, BUT you are interested in any other honks please let me know. I will gladly research it for you, as Costa Rica is the number honk research facility in the world.