Part of a planetary throughfare (4)

I believe the answer is:

lane

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'part' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'of a planetary throughfare' is the wordplay.
'of' indicates the answer is hidden within the clue.
'LANE' is hidden within 'planetary throughfare'.

Can you help me to learn more?

(Other definitions for lane that I've seen before include "Narrow country road" , "Rough path" , "Passage" , "Byroad" , "Narrow street" .)

I've seen this clue in the Sydney Morning Herald.

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