Who would have thought rooftops in China could provide so many news stories…On September 16, locals were startled to find a bulldozer plonked on the rooftop of a 17-storey building in Chongqing. Its purpose? To tear down the building from above!
Understandably, onlookers were curious as to how such a monster of machinery can even get to the top of such a high building and why they would even go to such great lengths for a demolition project.
It turns out the reason actually makes a lot of sense. According to the owner of the bulldozer, Mr. Liu, using explosives to raze the building was not an option in this case due its proximity to the city center; not only would an explosion pose a safety risk, it would have hurled lots of nasty, unhealthy dust particles into the air. And there you have it: next time you see an unusual piece of demolition machinery on the edge of high rooftop, rest assured that’s it’s all in the name of safety.
Source: sina.com.cn

strange bt true

That's not a bulldozer, it's an excavator.