M4 road closures & live traffic incidents

No live closures are reported on the M4 right now.

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

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Active roadworks

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M4 closures planned this week

M4 eastbound Jct 18 to 17 lane closure (166/5 to 162/1)

Planned Roadworks National Highways

South Gloucestershire M4 · M4 Eastbound Between J18 And J17

Starts in 5 hours 46 minutes

Starts 15 Oct 2026, 06:00 Expected clear 15 Oct 2026, 17:00

M4 eastbound Jct 18 to 17 lane closure (166/5 to 162/1)

Category: Road Maintenance

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M4 eastbound lane 1 and 2 closure (47/0 to 44/7)

Planned Roadworks National Highways

Windsor And Maidenhead M4 · M4 Eastbound Within J8

Starts in 18 hours 46 minutes

Starts 15 Oct 2026, 19:00 Expected clear 16 Oct 2026, 05:00

M4 eastbound lane 1 and 2 closure (47/0 to 44/7)

Category: Road Maintenance

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Lane closure

Planned Roadworks National Highways

Wiltshire M4 · M4 Westbound Between J16 And J17

Starts in 18 hours 46 minutes

Starts 15 Oct 2026, 19:00 Expected clear 16 Oct 2026, 05:00

lane closure

Category: Road Maintenance

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Recently cleared on the M4

All live closures M4 closure history