M4 Junction 42: Earlswood (A48, A483)
Junction 42 at Earlswood links the M4 to the A483 Fabian Way into Swansea and the A48 for Briton Ferry, under a mile east. Briton Ferry, Llandarcy and Jersey Marine are beside it. Pant y Sais National Nature Reserve is about a mile west.
Briton Ferry, Jersey Marine and the eastern side of Swansea are reached from Junction 42. The maps help if you are visiting, delivering or finding your way for the first time.
The M4 in England: live M4 speed flow map · latest M4 traffic news (Junctions 1 to 23)
M4 Junction 42: Live Traffic Information
This junction is on the M4 in Wales. National Highways’ live data, which our news, speed strip and records use, covers the M4 in England up to Junction 23. In Wales the motorway is run for the Welsh Government by Traffic Wales, so this page does not yet show live accidents, incidents, roadworks or speeds for this junction. We are working on adding them. Until then, check Traffic Wales before you travel.
- Junction M4 J42, Earlswood
- Roads at this junction A48, A483
- Nearest town Briton Ferry, 0.7 miles east
- Junction before J41, Pentyla, about 3.0 miles in a straight line
- Junction after J43, Llandarcy, about 1.1 miles in a straight line
Around M4 Junction 42: Earlswood: Towns and Places on the Map

| Place | What it is | From the junction |
|---|---|---|
| Briton Ferry | Railway station | About 1 mile east |
| Pant y Sais National Nature Reserve | Park or nature reserve | About 1 mile west |
| Baglan | Railway station | About 2 miles south-east |
| 1940s Swansea Bay | Attraction | About 2.5 miles south-west |
| Baglan Bay Retail Park | Shopping | About 2.5 miles south-east |
| Llansamlet | Railway station | About 2.5 miles north-west |
| Swansea.com Stadium | Venue | About 4 miles west |
| Afan Forest Park High Bridge | Attraction | About 4.5 miles east |