A bus of 1,200 passengers that passes over other cars

This new elevated bus passes the top of cars and let traffic to pass underneath it.
The vehicle is more like a cross between a tram and a bus. It was unveiled at a tech expo in China

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The idea of the engineers who designed this is to increase the availability of the road space, and cause fewer traffic jams than regular buses. It is also expected to save costs compared to other public transport options, like the subway.