Archaeological Work along the A419 near Swindon, which was due to take place next week, has been postponed.
Workers were due to investigate whether a noise fence, to dull traffic sounds, will damage an important ancient site.
The Highways Agency plans to put up the structure on a verge at Covingham which is protected by English Heritage.
The site is designated as a scheduled ancient monument for the Roman town of Durocornovium. The work is now due to take place later in the autumn.
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