M4 Junctions
The M4 runs from Chiswick in west London, past Heathrow, Reading, Swindon and Bristol, over the Severn into Wales, and on past Newport, Cardiff and Swansea to Pont Abraham. We have a page for every junction because most people's M4 journey starts and ends at one or two of them: the junction near home, the one by work, the one for the airport, or the one they come off to see family or visit somewhere.
Each page is written for the people who use that junction: commuters, airport travellers, delivery and lorry drivers, families and visitors. It shows a close-up map of the junction, a wider map of the towns and places around it, and the junctions either side. For Junctions 1 to 23, in England, each page also shows the live news, the live speeds and what our own records of National Highways data show has been happening there. Live information for the Welsh junctions is still to come.
- J1Chiswick RoundaboutA4, A205, A315, A406, A3000
- J2BrentfordA4, A205, A315
- J3Cranford ParkwayA312
- J4HeathrowA408, A3044
- J4AConcorde RoundaboutA4, A408
- J4BThorneyM25
- J5Langley RoundaboutA4
- J6Tuns LaneA332, A355
- J7Huntercombe Spur
- J8/9HolyportA308(M), A330, A404(M)
- J10WinnershA329(M)
- J11Three Mile CrossA33
- J12ThealeA4
- J13Chieveley InterchangeA34
- J14Wickham InterchangeA338
- J15Plough Hill InterchangeA346, A419
- J16SpittleboroughA3102
- J17Stanton St QuintinA350, A429
- J18Tormarton InterchangeA46
- J19HambrookM32
- J20AlmondsburyM5
- J21Awkley InterchangeM48
- J22PilningM49, A403
- J23RogietM48
- J23AMagorA4810
- J24ColdraA48, A449
- J25Caerleon Interchange
- J25AGrove ParkA4042
- J26Malpas InterchangeA4042, A4051
- J27High CrossA467
- J28Tredegar ParkA48, A467
- J29CastletonA48, A48(M)
- J30PentwynA4232
- J32CorytonA470, A4054
- J33Capel LlanillternA4119, A4232
- J34MiskinA4119
- J35Pen-coedA473
- J36SarnA4061, A4063
- J37PyleA48, A4229
- J38MargamA48, A4241
- J40TaibachA48, A4107, A4241
- J41PentylaA48, A4241
- J42EarlswoodA48, A483
- J43LlandarcyA465
- J44Lôn-lasA48, A4230
- J45YnysforganA4067
- J46LlangyfelachA48
- J47PenllergaerA48, A483, A4240
- J48HendyA4138
- J49Pont AbrahamA48, A483
Latest M4 Traffic News
Search all the latest M4 traffic news
Latest accident or incident on the M4
The most recent accident or incident on the M4 that we are aware of.
M4 eastbound between junctions J20 and J19: collision (RTC)
21:16 (9:16pm)21 Oct 2026reported 6 min ago
- Location
- M4 eastbound between junctions J20 and J19
- Direction
- Eastbound
- Lanes closed
- The hard shoulder is closed
- Reason
- Collision (RTC)
- Schedule
- 18:03 (6:03pm) Wed 21 Oct 2026 → 23:04 (11:04pm) Wed 21 Oct 2026
Latest active roadworks on the M4
Roadworks live on the M4 right now.
M4 eastbound lane 1 closure (119/8 to 119/0)
20:56 (8:56pm)21 Oct 2026reported 25 min ago
- Location
- M4 eastbound between J15 and J14
- Direction
- Eastbound
- Lanes closed
- Lane closures
- Reason
- Repair work
- Schedule
- 20:10 (8:10pm) Wed 21 Oct 2026 → 06:00 (6am) Thu 22 Oct 2026
+ 1 more active roadworks - search all M4 traffic news →
Latest planned roadworks on the M4
The next planned roadworks scheduled on the M4.
M4 eastbound Jct 13 between the slips carriageway closure
20:56 (8:56pm)21 Oct 2026reported 25 min ago
- Location
- M4 eastbound between J14 and J13
- Direction
- Eastbound
- Lanes closed
- Carriageway closed
- Reason
- Roadworks
- Schedule
- 21:00 (9pm) Wed 21 Oct 2026 → 06:00 (6am) Thu 22 Oct 2026
Forecast - not confirmed
+ 7 more planned roadworks - search all M4 traffic news →
Road closed — on the overhead signs now
National Highways’ overhead signs are showing a road closure, as at 21:22 (9:22pm) Wed 21 Oct 2026. 6 other serious messages are on the signs - see them all below.
M4 J21-J23 closed
Time now: Wednesday, 21 October 2026, 21:22 (9:22pm)21:10 (9:10pm)21 Oct 2026set 11 min ago✓ Checked by us 21:22 (9:22pm)
M4 J21-J23
CLOSEDOverhead Message
WhereM4 westbound, J13 to J19 · on 11 signsAlso onAlso showing on M5 signsSinceSet 21:10 (9:10pm) Wed 21 Oct 2026We check these overhead signs at least every five minutes, but we can't guarantee a sign is still current if an incident or issue has been cleared and the sign has not been updated yet. Signs and news can each carry something the other does not - check both before you travel.
Search all the latest M4 traffic news
Updated 21:22 (9:22pm) Wed 21 Oct 2026
Powered by National Highways’ Transport Data Feeds.