Crossword Genius

Road-carrying structures (8)

Ross

I believe the answer is:

viaducts

(Other definitions for viaducts that I've seen before include "Arched routes over valleys" , "Arches supporting roads and railways over valleys" , "Bridges to carry roads and railways over valleys" , "Bridges with arches spanning valleys" .)

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