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Di darat, berjalan di atas empat buah roda, sedangkan ketika berada di air, roda tersebut dimasukkan ke dalam lambung bus (seperti kapal) dan mengapunglah bis tersebut.
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Bis yang pertama kali dibuat di Malta, Eropa, ini tergolong bis mewah. Tapi tergantung modelnya juga, ada yang model standar, lux, dan open top.