Location: northbound exit slip at junction J19 (Portishead) .
Lane Closures : Lane two is closed.
Due to: Broken down vehicle.
Time To Clear : The event is expected to clear between 10:30 and 10:45 on 15 December 2025.
Normal traffic conditions are expected between 10:30 and 10:45 on 15 December 2025.
Lanes Closed : There is one of two lanes closed.
Nearest town: 15.73 miles from Common Cefn llwyn.

Description: M4 : Westbound : J29 (Cardiff) Castleton to J30 (Cardiff) Cardiff Gate : Congestion : Delays possible :, Start time: 15/12/2025 8:28 , Expected end time: 15/12/2025 9:58, Severity: Moderate, Source: Welsh Government, Last updated: 15/12/2025 8:28
Nearest town: 8.6 miles from Common Cefn llwyn.

Description: A4232 : Southbound : M4 J33 Capel Llanilltern to A48 Interchange : Congestion : Delays possible :, Start time: 15/12/2025 8:21 , Expected end time: 15/12/2025 9:51, Severity: Moderate, Source: Welsh Government, Last updated: 15/12/2025 8:21
Nearest town: 17.24 miles from Common Cefn llwyn.

Description: M4 : Westbound : J33 (Cardiff) Capel Llanilltern : Congestion : offslip : Delays possible :, Start time: 15/12/2025 8:21 , Expected end time: 15/12/2025 9:51, Severity: Moderate, Source: Welsh Government, Last updated: 15/12/2025 8:21
Nearest town: 17.25 miles from Common Cefn llwyn.

Description: M4 : Eastbound : J33 (Cardiff) Capel Llanilltern : Congestion : offslip : Delays possible :, Start time: 15/12/2025 8:09 , Expected end time: 15/12/2025 10:09, Severity: Moderate, Source: Welsh Government, Last updated: 15/12/2025 8:09
Nearest town: 17.25 miles from Common Cefn llwyn.

Description: A48M : Westbound : J29 Castleton to J29A St Mellons : Congestion : Delays possible :, Start time: 15/12/2025 8:12 , Expected end time: 15/12/2025 10:12, Severity: Moderate, Source: Welsh Government, Last updated: 15/12/2025 8:12
Nearest town: 8.51 miles from Common Cefn llwyn.

Description: A4232 : Northbound : A48 Interchange to M4 J33 Capel Llanilltern : Congestion : Delays possible :, Start time: 15/12/2025 8:12 , Expected end time: 15/12/2025 10:12, Severity: Moderate, Source: Welsh Government, Last updated: 15/12/2025 8:12
Nearest town: 17.24 miles from Common Cefn llwyn.

Description: M4 : Eastbound : J28 (Newport) Tredegar Park to J24 (Newport) Coldra : Congestion : Delays possible :, Start time: 15/12/2025 7:16 , Expected end time: 15/12/2025 9:16, Severity: Moderate, Source: Welsh Government, Last updated: 15/12/2025 7:16
Nearest town: 2.82 miles from Common Cefn llwyn.

Description: A470 : Southbound : Pontypridd to Coryton : Congestion :, Start time: 15/12/2025 6:44 , Expected end time: 15/12/2025 12:44, Severity: Moderate, Source: Welsh Government, Last updated: 15/12/2025 6:44
Nearest town: 13.95 miles from Common Cefn llwyn.

Description: A470 : Southbound : Nantgarw to Taffs Well : Incident : Lane closed : Delays possible :, Start time: 15/12/2025 6:17 , Expected end time: 15/12/2025 8:00, Severity: Moderate, Source: Welsh Government, Last updated: 15/12/2025 6:17
Nearest town: 14.3 miles from Common Cefn llwyn.

Location: eastbound between junctions J20 (Bristol) and J19 (Bristol) .
Lane Closures : The hard shoulder is closed.
Due to: Emergency resurfacing.
Period : from 20:10 on 13 December 2025 to 06:00 on 15 December 2025.
Nearest town: 19.19 miles from Common Cefn llwyn.

Description: A40 : Both directions : Pontargothi : 16/12/25-15/12/25 0900-1530 : Bridge : Emergency work : Closed : Diversions in place : 16/12/25 0900-1530 :, Start time: 16/12/2025 9:00 , End Date: 16/12/2025 15:30, Severity: Road closure, Source: Welsh Government, Last updated: 12/12/2025 9:03
Nearest town: 9.91 miles from Common Cefn llwyn.

Description: M4 : Both directions : J22 (Avonmouth) Pilning/Second Severn Crossing to J30 (Cardiff) Cardiff Gate : Poor driving conditions : Speed restrictions, Start time: 15/12/2025 6:05 , Expected end time: 15/12/2025 16:00, Severity: Slight, Source: Welsh Government, Last updated: 15/12/2025 6:05
Nearest town: 4.04 miles from Common Cefn llwyn.

Location: eastbound at junction J22 (Avonmouth) .
Lane Closures : The hard shoulder is closed.
Due to: Roadworks.
Period : expect disruption until 06:00 on 19 December 2025.
Nearest town: 13.99 miles from Common Cefn llwyn.

Location: westbound at junction J22 (Avonmouth) .
Lane Closures : The hard shoulder is closed.
Due to: Roadworks.
Period : expect disruption until 06:00 on 19 December 2025.
Nearest town: 14.06 miles from Common Cefn llwyn.

Location: southbound between junctions J18 (Bristol) and J19 (Portishead) .
Lane Closures : Lane four is closed.
Due to: Roadworks.
Period : expect disruption until 06:00 on 15 December 2025.
Lanes Closed : There is one of four lanes closed.
Nearest town: 15.87 miles from Common Cefn llwyn.

Location: eastbound between junctions J22 (Avonmouth) and J21 (Chepstow) .
Lane Closures : Lane two will be closed.
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 21:00 on 19 December 2025 to 06:00 on 20 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 17.22 miles from Common Cefn llwyn.

Location: eastbound between junctions J22 (Avonmouth) and J20 (Bristol) .
Lane Closures : Lane two will be closed.
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 21:00 on 19 December 2025 to 06:00 on 20 December 2025.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 17.52 miles from Common Cefn llwyn.

Location: northbound between junctions J15 (Almondsbury) and J14 (Dursley) .
Lane Closures : Lane two will be closed.
Due to: Barrier repairs are planned.
Status : Pending.
Schedule : From 20:00 on 19 December 2025 to 06:00 on 20 December 2025.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 19.37 miles from Common Cefn llwyn.

Location: northbound at junction J15 (Almondsbury) .
Lane Closures : Lane two will be closed.
Due to: Barrier repairs are planned.
Status : Pending.
Schedule : From 20:00 on 19 December 2025 to 06:00 on 20 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 19.07 miles from Common Cefn llwyn.

Location: southbound between junctions J14 (Dursley) and J15 (Almondsbury) .
Lane Closures : Lane three will be closed.
Due to: Barrier repairs are planned.
Status : Pending.
Schedule : From 20:00 on 19 December 2025 to 06:00 on 20 December 2025.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 19.5 miles from Common Cefn llwyn.

Location: northbound between junctions J21 (Weston super Mare) and J20 (Nailsea) .
Due to: Roadworks scheme is planned.
Status : Pending.
Schedule : From 20:00 on 19 December 2025 to 06:00 on 20 December 2025.
Nearest town: 19.83 miles from Common Cefn llwyn.

Location: northbound between junctions J21 (Weston super Mare) and J20 (Nailsea) .
Lane Closures : Lane one will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 20:00 on 19 December 2025 to 06:00 on 20 December 2025.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 19.83 miles from Common Cefn llwyn.

Location: northbound entry slip at junction J21 (Weston super Mare) .
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 19 December 2025 to 06:00 on 20 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 19.71 miles from Common Cefn llwyn.

Location: eastbound exit slip at junction J22 (Avonmouth) .
Lane Closures : Lanes 1 and 2 will be closed.
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 21:00 on 18 December 2025 to 06:00 on 19 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 13.99 miles from Common Cefn llwyn.

Location: eastbound entry slip at junction J22 (Avonmouth) .
Lane Closures : Lane one will be closed.
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 21:00 on 18 December 2025 to 06:00 on 19 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 14.23 miles from Common Cefn llwyn.

Location: southbound between junctions J16 (Thornbury) and J17 (Bristol West) .
Lane Closures : Lane one will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 18 December 2025 to 06:00 on 19 December 2025.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 17.84 miles from Common Cefn llwyn.

Location: southbound between junctions J19 (Portishead) and J20 (Nailsea) .
Lane Closures : Lane one will be closed.
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 20:00 on 18 December 2025 to 06:00 on 19 December 2025.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 15.49 miles from Common Cefn llwyn.

Location: southbound between junctions J19 (Portishead) and J20 (Nailsea) .
Lane Closures : Lane one will be closed.
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 20:00 on 18 December 2025 to 06:00 on 19 December 2025.
Lanes Closed : There will be one of four lanes closed.
Nearest town: 15.45 miles from Common Cefn llwyn.

Location: southbound at junction J18 (Bristol) .
Lane Closures : Lanes 1, 2 and 3 will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : Expect disruption everyday between 21:30 and 06:00 from 15 December 2025 to 20 December 2025.
Schedule : Expect disruption everyday between 21:30 and 06:00 from 5 January 2026 to 7 January 2026.
Schedule : Expect disruption everyday between 21:30 and 06:00 from 8 January 2026 to 10 January 2026.
Schedule : From 21:00 on 10 January 2026 to 06:00 on 11 January 2026.
Lanes Closed : All lanes will be closed.
Nearest town: 15.96 miles from Common Cefn llwyn.

Location: southbound at junction J18 (Bristol) .
Lane Closures : Lane three will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 7 January 2026 to 06:00 on 8 January 2026.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 15.96 miles from Common Cefn llwyn.

Location: southbound between junctions J18 (Bristol) and J19 (Portishead) .
Lane Closures : Lanes 1, 2 and 3 will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : Expect disruption everyday between 21:30 and 06:00 from 15 December 2025 to 20 December 2025.
Schedule : Expect disruption everyday between 21:30 and 06:00 from 5 January 2026 to 7 January 2026.
Schedule : Expect disruption everyday between 21:30 and 06:00 from 8 January 2026 to 10 January 2026.
Schedule : From 21:00 on 10 January 2026 to 06:00 on 11 January 2026.
Lanes Closed : There will be three of four lanes closed.
Nearest town: 15.87 miles from Common Cefn llwyn.

Location: southbound at junction J19 (Portishead) .
Lane Closures : Lane three will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 7 January 2026 to 06:00 on 8 January 2026.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 15.9 miles from Common Cefn llwyn.

Location: southbound between junctions J18 (Bristol) and J19 (Portishead) .
Lane Closures : Lanes 3 and 4 will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 7 January 2026 to 06:00 on 8 January 2026.
Lanes Closed : There will be two of four lanes closed.
Nearest town: 15.87 miles from Common Cefn llwyn.

Location: westbound between junctions J21 (Chepstow) and J22 (Avonmouth) .
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 21:00 on 17 December 2025 to 06:00 on 18 December 2025.
Nearest town: 14.64 miles from Common Cefn llwyn.

Location: southbound between the junctions with the M4 and the M5 .
Lane Closures : Lane two will be closed.
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 21:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 15.71 miles from Common Cefn llwyn.

Location: northbound between the junctions with the M5 and the M4 .
Lane Closures : Lane two will be closed.
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 21:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 15.88 miles from Common Cefn llwyn.

Location: northbound exit slip at junction J18A (South Wales) .
Lane Closures : Lane two will be closed.
Due to: Roadside drains works are planned.
Status : Pending.
Schedule : From 21:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 15.94 miles from Common Cefn llwyn.

Location: southbound exit slip at junction J15 (Almondsbury) .
Lane Closures : Lane one will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 19.2 miles from Common Cefn llwyn.

Location: eastbound entry slip at junction J20 (Bristol) from M5 south.
Lane Closures : Lane one will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 19.12 miles from Common Cefn llwyn.

Location: southbound between junctions J14 (Dursley) and J15 (Almondsbury) .
Lane Closures : Lane one will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 19.4 miles from Common Cefn llwyn.

Location: northbound at junction J18 (Bristol) .
Lane Closures : Lanes 1 and 2 will be closed.
Due to: Barrier repairs are planned.
Status : Pending.
Schedule : Expect disruption everyday between 21:00 and 06:00 from 17 December 2025 to 19 December 2025.
Lanes Closed : There will be two of four lanes closed.
Nearest town: 15.79 miles from Common Cefn llwyn.

Location: southbound exit slip at junction J18 (Bristol) .
Lane Closures : Lane one will be closed.
Due to: Barrier repairs are planned.
Status : Pending.
Schedule : Expect disruption everyday between 21:00 and 06:00 from 17 December 2025 to 19 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 15.83 miles from Common Cefn llwyn.

Location: westbound between the M4 and junction J1 (Avonmouth) .
Due to: Roadworks scheme is planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 06:00 on 18 December 2025.
Nearest town: 16.89 miles from Common Cefn llwyn.

Location: westbound at junction J1 (Avonmouth) .
Lane Closures : Lanes 1 and 2 will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 15.52 miles from Common Cefn llwyn.

Location: westbound between the M4 and junction J1 (Avonmouth) .
Lane Closures : Lane two will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 16.89 miles from Common Cefn llwyn.

Location: westbound entry slip at junction J22 (Avonmouth) .
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 20:30 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 14.2 miles from Common Cefn llwyn.

Location: northbound between the junctions with the M5 and the M4 .
Lane Closures : Lane one will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 14.42 miles from Common Cefn llwyn.

Location: westbound between junctions J20 (Bristol) and J21 (Chepstow) .
Lane Closures : Lane two will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 18.06 miles from Common Cefn llwyn.

Location: westbound between junctions J20 (Bristol) and J22 (Avonmouth) .
Due to: Roadworks scheme is planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 06:00 on 18 December 2025.
Nearest town: 18.06 miles from Common Cefn llwyn.

Location: westbound between junctions J21 (Chepstow) and J22 (Avonmouth) .
Lane Closures : Lane two will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 21:00 on 17 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 17.57 miles from Common Cefn llwyn.

Location: westbound entry slip at junction J22 (Avonmouth) .
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 14.21 miles from Common Cefn llwyn.

Location: westbound between junctions J1 (Avonmouth) and J2 (Chepstow) .
Lane Closures : Lane two will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 21:00 on 17 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 14.87 miles from Common Cefn llwyn.

Location: northbound between the junctions with the M5 and the M4 .
Lane Closures : Lane one will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 14.38 miles from Common Cefn llwyn.

Location: westbound between junctions J21 (Chepstow) and J22 (Avonmouth) .
Lane Closures : Lane two will be closed.
Due to: Road repairs are planned.
Status : Pending.
Schedule : From 20:00 on 16 December 2025 to 06:00 on 17 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 14.93 miles from Common Cefn llwyn.

Location: eastbound exit slip at junction J22 (Avonmouth) .
Lane Closures : Lanes 1 and 2 will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 16 December 2025 to 06:00 on 17 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 13.99 miles from Common Cefn llwyn.

Location: eastbound between junctions J23 (Chepstow) and J22 (Avonmouth) .
Due to: Roadworks scheme is planned.
Status : Pending.
Schedule : From 21:00 on 16 December 2025 to 06:00 on 17 December 2025.
Nearest town: 10.52 miles from Common Cefn llwyn.

Location: eastbound between junctions J23 (Chepstow) and J22 (Avonmouth) .
Lane Closures : Lanes 1, 2 and 3 will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 21:00 on 16 December 2025 to 06:00 on 17 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 10.52 miles from Common Cefn llwyn.

Location: eastbound between junctions J2 (Chepstow) and J1 (Avonmouth) .
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 19:00 on 16 December 2025 to 06:00 on 17 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 13.03 miles from Common Cefn llwyn.

Location: eastbound between junctions J22 (Avonmouth) and J21 (Chepstow) .
Due to: Roadworks are planned.
Status : Pending.
Schedule : From 08:00 on 16 December 2025 to 17:00 on 16 December 2025.
Nearest town: 16.98 miles from Common Cefn llwyn.

Location: eastbound at junction J22 (Avonmouth) .
Lane Closures : Lane one will be closed.
Due to: Road repairs are planned.
Status : Pending.
Schedule : From 20:00 on 17 December 2025 to 06:00 on 18 December 2025.
Lanes Closed : There will be one of two lanes closed.
Nearest town: 13.99 miles from Common Cefn llwyn.

Location: northbound between junctions J19 (Portishead) and J18 (Bristol) .
Lane Closures : Lanes 1, 2 and 3 will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : Expect disruption everyday between 21:00 and 06:00 from 15 December 2025 to 19 December 2025.
Schedule : From 22:00 on 19 December 2025 to 06:00 on 20 December 2025.
Lanes Closed : There will be three of four lanes closed.
Nearest town: 15.92 miles from Common Cefn llwyn.

Location: northbound at junction J19 (Portishead) .
Lane Closures : Lanes 1, 2 and 3 will be closed.
Due to: Roadworks are planned.
Status : Pending.
Schedule : Expect disruption everyday between 21:00 and 06:00 from 15 December 2025 to 19 December 2025.
Schedule : From 22:00 on 19 December 2025 to 06:00 on 20 December 2025.
Lanes Closed : All lanes will be closed.
Nearest town: 15.77 miles from Common Cefn llwyn.

Location: northbound between junctions J18A (South Wales) and J17 (Bristol West) .
Lane Closures : The hard shoulder is closed.
Due to: Horticultural works.
Period : expect disruption until 16:00 on 15 December 2025.
Nearest town: 16.45 miles from Common Cefn llwyn.

Location: southbound between junctions J17 (Bristol West) and J18 (Bristol) .
Lane Closures : The hard shoulder is closed.
Due to: Horticultural works.
Period : expect disruption until 16:00 on 15 December 2025.
Nearest town: 16.77 miles from Common Cefn llwyn.

Location: northbound at junction J20 (Nailsea) .
Lane Closures : Lane one will be closed.
Due to: Emergency roadside drains works are planned.
Status : Pending.
Schedule : Expect disruption everyday between 20:00 and 04:00 from 15 December 2025 to 28 March 2026.
Schedule : From 20:00 on 28 March 2026 to 04:00 on 29 March 2026.
Schedule : Expect disruption everyday between 20:00 and 04:00 from 29 March 2026 to 1 April 2026.
Lanes Closed : There will be one of three lanes closed.
Nearest town: 15.46 miles from Common Cefn llwyn.
