M4 road closures &amp; live traffic incidents

Windsor And Maidenhead M4 · Roundabout At M4 J8/A404(M) J9/A308(M)

Starts in 11 hours 58 minutes

Starts 20 Jul 2026, 19:00 Expected clear 21 Jul 2026, 05:00

M4 eastbound lane 1, 2 and 3 closure (47/0 - 41/6)

M4 eastbound lane 3 closure (105/2 to 102/2)

West Berkshire M4 · M4 Eastbound Within J14

Starts in 11 hours 58 minutes

Starts 20 Jul 2026, 19:00 Expected clear 21 Jul 2026, 05:00

M4 eastbound lane 3 closure (105/2 to 102/2)

M4 eastbound Jct 22 to Jct 23 Prince of Wales bridge - lane closure 201/5-195/5

Monmouthshire M4 · M4 Eastbound Within J22

Starts in 11 hours 58 minutes

Starts 20 Jul 2026, 19:00 Expected clear 21 Jul 2026, 05:00

M4 eastbound Jct 22 to Jct 23 Prince of Wales bridge - lane closure 201/5-195/5

M4 eastbound Jct 19 to Jct 18 lane 3&2 leading to hardshoulder running (179/7 to 175/4)

South Gloucestershire M4 · M4 Eastbound Between J19 And J18

Starts in 12 hours 7 minutes

Starts 20 Jul 2026, 19:09 Expected clear 21 Jul 2026, 05:00

M4 eastbound Jct 19 to Jct 18 lane 3&2 leading to hardshoulder running (179/7 to 175/4)

M4 eastbound Jct 11 to Jct 10 carriageway closure

Reading M4 · M4 Eastbound Within J11

Starts in 12 hours 58 minutes

Starts 20 Jul 2026, 20:00 Expected clear 21 Jul 2026, 05:00

M4 eastbound Jct 11 to Jct 10 carriageway closure

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

Slough M4 · M4 Eastbound Between J6 And J5

Starts in 12 hours 58 minutes

Starts 20 Jul 2026, 20:00 Expected clear 21 Jul 2026, 05:00

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

M4 Eastbound Jct 4 entry slip road closure

Hounslow M4 · M4 J4 Eastbound Access

Starts in 13 hours 58 minutes

Starts 20 Jul 2026, 21:00 Expected clear 21 Jul 2026, 04:30

M4 Eastbound Jct 4 entry slip road closure