Overnight road closures

The M4 eastbound carriageway is closed from 20:00 until 06:00 tomorrow — about 10 hours.
You will need another route — the main carriageway is shut.

Also closed on

Tomorrow Wed 14 Oct Thu 15 Oct

Exactly where

M4 eastbound Jct 18 between exit and entry slip road carriageway closure

Why the road is closed

M4 eastbound Jct 18 between exit and entry slip roads - carriageway closure for resurfacing

Diversion route

Diversion via exit and entry slip roads

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The M4 westbound carriageway is closed from 22:00 until 06:00 tomorrow — about 8 hours.
You will need another route — the main carriageway is shut.

Exactly where

M4 Westbound Jct 16 to 17 carriageway closure

Why the road is closed

M4 Westbound Jct 16 to 17 carriageway closure for carriageway reconstruction.

Diversion route

Diversion via A3102, A4 and A350.

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The M4 northbound exit slip road is closed now, from 22:00 on Sunday until 06:00 on Saturday — about 1305 hours.
The road stays open. You cannot come off here — carry on to the next junction.

Also closed on

Sun 11 Oct Tonight Tomorrow Wed 14 Oct Thu 15 Oct

Exactly where

M4 westbound Jct 20 exit slip road to M5 northbound Jct 15 - carriageway closed

Why the road is closed

M4 westbound Jct 20 exit slip road to M5 northbound Jct 15 - carriageway closure for structure maintenance.

Diversion route

Diversion via M5 southbound, exit Jct 16 to turn and return M5 northbound.

Part of a scheme running until 5 Dec 2026

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The M4 eastbound exit slip road is closed from 21:00 until 06:00 tomorrow — about 9 hours.
The road stays open. You cannot come off here — carry on to the next junction.

Exactly where

M4 eastbound Jct 8/9 exit slip road closure

Why the road is closed

M4 eastbound Jct 8/9 - slip road and lane closure for technology work.

Diversion route

National Highways have not published a diversion for this closure. Follow the signs on the road — and if you are driving an HGV, check the route suits your height and weight before committing to it.

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The M4 eastbound exit slip road is closed from 22:00 until 05:30 tomorrow — about 7.5 hours.
The road stays open. You cannot come off here — carry on to the next junction.

Also closed on

Tonight Tomorrow Wed 14 Oct Thu 15 Oct

Exactly where

M4 Eastbound Jct 2 exit slip road closure

Why the road is closed

M4 Eastbound Jct 3 to Jct 2 Slip road and lane closure for concrete work

Diversion route

Diversion via Local Authority and National highway network

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🔔 Get told before this happens again Early Warning alerts you the moment the M4 closes or backs up — straight to your phone. Set up →