Work has begun to replace the Wolvercote viaduct.
The Highways Agency started clearance work at the site on Monday in a bid to avoid disturbing birds which nest in the area during the Spring.
Overnight lane closures are expected on the A34 in coming months while material is removed from the site.
The Highways Agency expect to start building work to replace the Wolvercote viaduct, which was built in 1961, later in the summer.
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