Breakdown Recovery on the M4
The M4 links London with Bristol and South Wales, running from Chiswick past Heathrow, Reading and Swindon, over the Severn and through Newport and Cardiff towards Swansea. Wherever you've broken down along it, call us with the nearest junction and we'll send a local recovery operator to you.
From £125 · 24/7 · often with you in about 30 minutes (depends on location and traffic)
From west London to West Wales
The M4 begins in Chiswick in west London and runs for about 190 miles to Pont Abraham in Carmarthenshire. Along the way it serves Heathrow, the Thames Valley towns of Slough, Maidenhead and Reading, Swindon, the Bristol area, and the three big South Wales cities of Newport, Cardiff and Swansea. That makes it a commuter road, an airport road and a long-distance route all at once.
London, Heathrow and the Thames Valley (junctions 1–12)
At the London end the M4 includes an elevated section through Brentford before reaching Heathrow (junction 4) and the M25 (junction 4b). It then runs west past Slough, Maidenhead and the western edge of London to Reading. This stretch is a smart motorway for much of its length, carries heavy traffic for most of the day, and often has very little room to stop safely.
Newbury, Swindon and the M5 (junctions 13–20)
West of Reading the motorway runs through open countryside past Newbury (the A34 at junction 13, by Chieveley services), Membury services and Swindon (junctions 15 and 16), then on past Leigh Delamere services to the Almondsbury interchange with the M5 at junction 20, just north of Bristol. Junctions are further apart here, so the services and driver location signs are the easiest way to tell us where you are.
Crossing the Severn into Wales (junctions 21–23)
The M4 crosses the Severn Estuary on the Prince of Wales Bridge (the Second Severn Crossing), while the older Severn Bridge carries the M48. Both are now toll-free. The bridges are exposed to strong crosswinds, and lanes or the whole crossing can be restricted in bad weather. If you break down on or near a bridge, tell us which one you're on.
Newport, Cardiff and Swansea (junctions 23–49)
In Wales the M4 passes Newport through the Brynglas Tunnels, a well-known bottleneck with a lower speed limit, then runs around the north of Cardiff (junctions 29 to 33). It continues past Bridgend and through Port Talbot, where the motorway runs close to the steelworks with tight junctions, before reaching Swansea and its end at Pont Abraham.
If you break down on the M4: get as far left as you can, onto the hard shoulder or into an emergency area. Put your hazard lights on, leave the vehicle by the left-hand door if it's safe and wait behind the barrier. If you're in a live lane and can't get out safely, stay in the car with your seatbelt on and call 999. Then call us with the junction numbers either side of you and your direction.
M4 Breakdown FAQs
I've broken down in the Brynglas Tunnels at Newport. What should I do?
Put your hazard lights on and, if you can, stay in the vehicle with your seatbelt on unless you can reach a safe place out of the traffic. Call 999 if you're stopped in a live lane. The tunnels are monitored, and traffic officers will usually respond first. Once you're somewhere safe, call us and we'll arrange recovery.
Do you cover the M4 in Wales as well as England?
Yes. We arrange recovery along the whole M4, from London through Bristol and over the Severn to Newport, Cardiff, Swansea and Pont Abraham.
How do I tell you where I am on the M4?
Give us the last junction or services you passed and your direction of travel, for example westbound towards Cardiff, or read out the number on the nearest blue driver location sign. You can also share your live location with us on WhatsApp.
Other Services You Might Need
Nearby areas & roads
Broken Down on the M4 Right Now?
Call or WhatsApp us with your location and we’ll arrange recovery to you.
