Part of the M25 near Brentwood is set to be shut overnight this weekend to allow concrete pipes to be installed.
The M25 anti-clockwise will be closed between junctions 29 and 27 from 10pm to 7am today (November 3) and Saturday (November 4), according to National Highways.
Junction 28, which is being upgraded, plays a "huge role" in connecting the A12 and the M25, according to the government body, and provides access to Brentwood via the A1023.
National Highways has said it is preparing to lift the new Weald Brook culvert into place, made using hollow concrete sections.
"Due to the brook being so close to the carriageway, we'll need to close the M25 anti-clockwise between junctions 29 and 27 for a couple of nights," the body explained.
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"We understand that closures are frustrating, so we appreciate everyone's patience as we work to improve this busy junction," it added.
A diversion will be in place via the A127, A406 and M11, National Highways confirmed.
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