One of the things Heathrow have been looking at is doing what many other airports have done around the world, which is to build the runway over the top of the road rather than underneath it.
I have to admit I'm quite surprised that the idea of an underground runway was even being considered. It's probably for the best that they've decided against it.
(Yes, yes, I know; it turns out he was referring to putting the M25 in a tunnel, not the runway. But that's not what he said — and his comment was widely reported entirely straight-facedly by the media yesterday.)
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