M4 westbound slip road closure at J20, 12 Sep 2026

Cleared

This incident on the M4 has cleared. It started at 18:46 on Sat 12 Sep and cleared at 18:53 on Sat 12 Sep.

Last updated by National Highways at 18:53 on Saturday 12 September 2026.

Closure details and map

Status: Cleared
Closure type: Slip road closure
Category: Incident
Road: M4
Direction: Westbound
Junctions: J20
Location: link road from M4 westbound J20 to M5 J15
Started: 18:46 on Saturday 12 September 2026
Cleared: 18:53 on Saturday 12 September 2026
Source: National Highways
Last updated by the source: 18:53 on Saturday 12 September 2026

Map of the M4 westbound slip road closure at J20

Cleared

Other M4 closures and crash records

14 other closures are in force on the M4 right now, and 42 more are planned in the next 7 days.

The M4 accident statistics from 1979 to 2025 record 29,200 collisions on the road, 724 of them fatal.

All M4 closures

Active roadworksLane closureNational Highways
M4 eastbound lane closure between J23 and J22, active roadworks, started Mon 5 Oct, 21:00
Expected to clear in about 45 minutes
Road
M4
Direction
Eastbound
Junctions
J23 to J22
Started
Mon 5 Oct, 21:00
Expected to clear
Tue 6 Oct, 06:00
Category
Road Maintenance
Active roadworksLane closureTraffic Wales
M4 westbound lane closure at J23 Rogiet, active roadworks, started Mon 5 Oct, 21:00
Expected to clear in 1 day
Road
M4
Direction
Westbound
Junctions
J23
Area
J23 Rogiet
Started
Mon 5 Oct, 21:00
Expected to clear
Wed 7 Oct, 06:00
Category
Carriageway Maintenance
Active roadworksLane closureNational Highways
M4 eastbound lane closure between J19 and J18, active roadworks, started Mon 5 Oct, 20:15
Expected to clear in about 45 minutes
Road
M4
Direction
Eastbound
Junctions
J19 to J18
Started
Mon 5 Oct, 20:15
Expected to clear
Tue 6 Oct, 06:00
Category
Road Maintenance
Active roadworksMobile lane closureNational Highways
M4 mobile lane closure in both directions between J18 and J17, active roadworks, started Mon 5 Oct, 20:00
Expected to clear in about 45 minutes
Road
M4
Direction
Both directions
Junctions
J18 to J17
Started
Mon 5 Oct, 20:00
Expected to clear
Tue 6 Oct, 06:00
Category
Road Maintenance
Active roadworksRoad closureTraffic Wales
M4 road closure in both directions between J25A and J27, active roadworks, started Mon 5 Oct, 20:00
Expected to clear in 4 days
Road
M4
Direction
Both directions
Junctions
J25A to J27
Area
J25A Grove Park to J27 High Cross
Started
Mon 5 Oct, 20:00
Expected to clear
Sat 10 Oct, 06:00
Category
Carriageway Maintenance
Active roadworksEntry slip road closureTraffic Wales
M4 eastbound entry slip road closure between J24 and J22, active roadworks, started Mon 5 Oct, 20:00
Expected to clear in 3 days
Road
M4
Direction
Eastbound
Junctions
J24 to J22
Area
J24 Coldra to J22 Pilning/Prince of Wales Bridge
Started
Mon 5 Oct, 20:00
Expected to clear
Fri 9 Oct, 06:00
Category
Surveys

Closure details and map

Other M4 closures and crash records

M4 eastbound lane closure between J23 and J22, active roadworks, started Mon 5 Oct, 21:00

M4 westbound lane closure at J23 Rogiet, active roadworks, started Mon 5 Oct, 21:00

M4 eastbound lane closure between J19 and J18, active roadworks, started Mon 5 Oct, 20:15

M4 mobile lane closure in both directions between J18 and J17, active roadworks, started Mon 5 Oct, 20:00

M4 road closure in both directions between J25A and J27, active roadworks, started Mon 5 Oct, 20:00

M4 eastbound entry slip road closure between J24 and J22, active roadworks, started Mon 5 Oct, 20:00