One of the biggest buses in the world is the Neaoplan Jumbocruiser, an articulated double-deck bus, is considered the biggest bus in the world, capable of carrying up to 170 passengers.
It was built by Neoplan BUS CmbH in Germany.
The smallest bus in the world is the Technobus Gulliver U520, used for public transportation. It is a transit but specifically designed for navigating tight European-style- city streets.
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