What does "noise barrier" mean?

Synonym of sound barrier (sense 2).

What is a synonym for "noise barrier"?

Common synonyms include: soundproofs.

noun

noun ·Rare ·Advanced level

Noun

1
Synonym of sound barrier (sense 2).
"Over the next three years, the 1.9 [?] cubic metres of spoil extracted will be reused for embankments, noise barriers and landscaping."

"Over the next three years, the 1.9 [?] cubic metres of spoil extracted will be reused for embankments, noise barriers and landscaping."