M4 road closures & live traffic incidents

No live incident closures on the M4 right now, but 1 roadwork is currently in force.

Live M4 updates from National Highways and Traffic Wales: incident closures, roadworks in force, planned closures for the week ahead and recently cleared disruption.

Live incident

Active roadworks

Planned

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M4 roadworks in force now

M4 eastbound Jct 18 to 17 - single lane running (166/1 to 161/7)

Active Roadworks National Highways

South Gloucestershire M4 · M4 Eastbound Between J18 And J17

Expected to clear in 4 hours 5 minutes

Started 4 Aug 2026, 18:47 Expected clear 5 Aug 2026, 05:00

M4 eastbound Jct 18 to 17 - single lane running (166/1 to 161/7)

Category: Road Maintenance

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M4 closures planned this week

M4 eastbound Jct 18 to 17 - single lane running (166/1 to 161/7)

Planned Roadworks National Highways

South Gloucestershire M4 · M4 Eastbound Between J18 And J17

Starts in 18 hours 5 minutes

Starts 5 Aug 2026, 19:00 Expected clear 6 Aug 2026, 05:00

M4 eastbound Jct 18 to 17 - single lane running (166/1 to 161/7)

Category: Road Maintenance

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M4 westbound Jct 6 entry slip road closure

Planned Roadworks National Highways

Slough M4 · M4 J6 Westbound Access

Starts in 19 hours 5 minutes

Starts 5 Aug 2026, 20:00 Expected clear 6 Aug 2026, 05:00

M4 westbound Jct 6 entry slip road closure

Category: Road Maintenance

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M4 eastbound Jct 20 - lane closure (188/3 to 186/9)

Planned Roadworks National Highways

South Gloucestershire M4 · M4 Eastbound Within J20

Starts in 19 hours 35 minutes

Starts 5 Aug 2026, 20:30 Expected clear 6 Aug 2026, 05:00

M4 eastbound Jct 20 - lane closure (188/3 to 186/9)

Category: Road Maintenance

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Recently cleared on the M4

All live closures M4 closure history