It's in london that the traffic is noisiest.
I don't get whether that's a relative clause. To my best knowledge, a relative clause is a incomplete sentence except for a whose clause.
anonymous It's in L ondon that the traffic is noisiest . I don't get whether that's a relative clause. That's understandable.
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anonymousIt's in London that the traffic is noisiest.
I don't get whether that's a relative clause. ...
That's understandable. It's unusual.
You have a cleft construction here. That's a sentence in the form
It is [highlighted element] that [rest of the s