Sections of the M4 north of Bristol will be shut in both directions between junctions 18 (Bath) and 19 (M32) from 8pm to 6am each night between January 5 and January 10.
National Highways says the closures are needed to safely remove concrete casings from the sides of the new A432 Badminton Road bridge, which is nearing completion.
Sean Walsh, route manager for National Highways, said: “We’ve made positive progress on the bridge and it’s great to see it nearing completion.
“In the new year, we’ll be working more on the sides of the bridge and eventually reconnecting it to the existing A432, which is a huge milestone for the project.
“Whilst all work in the new year is weather dependent, we are on course to reopen the bridge in the spring and thank drivers and local residents for their continued patience.”
Once the concrete casing is removed, further earthworks and construction will take place in January and February.
A diversion will be in place during the overnight closures.
Drivers will be directed from junction 18 onto the A46 towards Bath, then the A420 towards Warmley, and the A4174 towards the M32.
The diversion re-joins the M4 at junction 19.
The Badminton Road bridge, built in 1966, was closed in July 2023 after a structural investigation revealed issues on its underside.
National Highways determined that demolition and replacement was the quickest and most cost-effective way to restore the route.
The new bridge is expected to open to traffic in early 2026.
Further details can be found on the National Highways website at nationalhighways.co.uk.
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