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

M25 Clockwise Jct 15 to Jct 16 and M4 Eastbound and westbound link road closure to M25 Anti-clockwise

Active Roadworks National Highways

Slough M4 · Link Road From M4 J4B Eastbound To M25 J15

Expected to clear in 1 hour 27 minutes

Started 21 Aug 2026, 22:00 Expected clear 22 Aug 2026, 05:00

M25 Clockwise Jct 15 to Jct 16 and M4 Eastbound and westbound link road closure to M25 Anti-clockwise

Category: Road Maintenance

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M4 Eastbound Jct 19 to 18 lane 1 closure 178/8b - 176/3b

Planned Roadworks National Highways

South Gloucestershire M4 · M4 Eastbound Between J19 And J18

Expected to clear in 1 hour 27 minutes

Started 21 Aug 2026, 20:00 Expected clear 22 Aug 2026, 05:00

M4 Eastbound Jct 19 to 18 lane 1 closure 178/8b - 176/3b

Category: Road Maintenance

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Recently cleared on the M4

All live closures M4 closure history