OVERNIGHT lane closures on the M5 near Weston-super-Mare are set to cause disruption for drivers this week.
The closures affect the M5 junction 21 overbridges as part of essential maintenance works to replace expansion joints.
Two full overnight closures will take place between 10pm and 6am, until Thursday, July 23, with lane closures in effect on other nights.
Works started on Saturday, June 20.
🚧 M5 J21 essential bridge maintenance
Overnight closures of overbridges (10pm–6am):
📍30 June – westbound overbridge
📍1 July – eastbound overbridge
M5 remains open. Diversions via J22 (30 June) & J20 (1 July)
Info: https://t.co/J0IHVFd3Cf
Please plan ahead#WestonSuperMare pic.twitter.com/kcZPeWinOA— National Highways: South-West (@HighwaysSWEST) June 29, 2026
A spokesperson for National Highways said: "We're replacing expansion joints on two bridges over the M5 at junction 21.
"This keeps the bridges safe for everyone using them."
Both bridges will remain open during the day and at weekends, and the M5 itself will stay open throughout the works.
According to the spokesperson, most nights, the work involves overnight lane closures on the bridges.
However, on June 30, the westbound overbridge will close fully.
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This bridge takes traffic towards Weston-super-Mare and the M5 northbound entry slip.
Traffic will be diverted onto the M5 southbound to junction 22 before returning northbound to junction 21.
The eastbound overbridge will also be closed the following night, on July 1.
This bridge takes traffic towards Rolstone and the M5 southbound entry slip.
Drivers will be directed northbound to junction 20 and then southbound back to junction 21.
Non-motorway traffic stopped at the bridge approaches will be escorted through, with delays of five to ten minutes expected.
National Highways has advised road users to allow extra time for their journeys, noting that dates may change due to weather or operational reasons.
Nearby works, including the St Georges Bridge scheme, may also result in overnight lane and slip road closures.
The latest information on closures is available from National Highways via their daily closures page, Traffic England, and travel alerts.
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