M4 road closures & live traffic incidents

No live incident closures on the M4 right now, but 2 roadworks are 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

Cleared

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M4 roadworks in force now

M4 eastbound lane 1, 2 and 3 closure (34/6 to 32/1)

Planned Roadworks National Highways

Slough M4 · M4 Eastbound Between J6 And J5

Expected to clear in 2 hours 25 minutes

Started 30 Jul 2026, 20:00 Expected clear 31 Jul 2026, 05:00

M4 eastbound lane 1, 2 and 3 closure (34/6 to 32/1)

Category: Road Maintenance

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M4 westbound Jct 21 to 22 lane closure 194/2-195/0

Planned Roadworks National Highways

South Gloucestershire M4 · M4 Westbound Between J21 And J22

Expected to clear in 2 hours 25 minutes

Started 30 Jul 2026, 20:00 Expected clear 31 Jul 2026, 05:00

M4 westbound Jct 21 to 22 lane closure 194/2-195/0

Category: Road Maintenance

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M4 closures planned this week

M4 westbound Jct 8/9 entry slip road closure

Planned Roadworks National Highways

Windsor And Maidenhead M4 · M4 J8 Westbound Access

Starts in 17 hours 25 minutes

Starts 31 Jul 2026, 20:00 Expected clear 1 Aug 2026, 05:00

M4 westbound Jct 8/9 entry slip road closure

Category: Road Maintenance

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M4 Eastbound Jct 22 to 21 lane 2 closure 194/5b - 193/8b

Planned Roadworks National Highways

South Gloucestershire M4 · M4 Eastbound Between J22 And J21

Starts in 17 hours 25 minutes

Starts 31 Jul 2026, 20:00 Expected clear 1 Aug 2026, 05:00

M4 Eastbound Jct 22 to 21 lane 2 closure 194/5b - 193/8b

Category: Road Maintenance

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M4 Northbound Jct 4A to Jct 4 lane 1 closure

Planned Roadworks National Highways

Hounslow M4 · M4 Spur (Heathrow) Southbound Between M4 And J4A

Starts in 19 hours 25 minutes

Starts 31 Jul 2026, 22:00 Expected clear 1 Aug 2026, 04:30

M4 Northbound Jct 4A to Jct 4 lane 1 closure

Category: Road Maintenance

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Recently cleared on the M4

All live closures M4 closure history