China proposes car-straddling buses (or are they trains?)

Many, many people have sent in tips about this project in China to build huge buses the width of two car lanes, which can run on guideways straddling the road and travel above the cars:

But wouldn’t it be easier just to dedicate a bus lane? Via the Huffington Post.

Update: Several commenters have also pointed out that, despite the Huffington Post headline, since this will run on rails it’s really a train, not a bus.