Earlswood Interchange

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Earlswood Interchange
Location Map ( geo)
On top of the new viaduct over the River Neath at J42, Briton Ferry-Llansawel. Access here is to Swansea only via the A483. - Coppermine - 7377.jpg
Cameraicon.png View gallery (5)
Location
Earls Wood
County
Glamorgan
Highway Authority
Welsh Government
Junction Type
Modified trumpet
Roads Joined
M4, A48, A483
Junctions related to the A483
Croesfoel Interchange • Crossgates roundabout • Gresford Interchange • Halton Roundabout • Johnstown Interchange • Llandeilo Roundabout • Llynclys Crossroads • Mile End Roundabout • Mold Road Interchange • Penllergaer Interchange • Pont Abraham Interchange • Rossett Interchange • Ruabon Interchange • Ruthin Road Interchange • Sarn Bryn Caled Roundabout • The Old Station roundabout • Wrexham Road Interchange

Earlswood Interchange is junction 42 of the M4 motorway and links with the A48 and A483.


History

In the 1940s a small ferry crossed the River Neath (Afon Nedd) about a mile up river from the north-east corner of Swansea bay. In 1955 the ferry was replaced by the first Briton Ferry Bridge which soared high above the river to allow for shipping. On the western shore of the river a simple Earlswood interchange (an at grade roundabout) was built. The new bridge and the link northwards were numbered A48, with the route to Swansea eventually taking the number A483.

The roundabout was heavily modified in the 1980s and became a signal controlled junction, the basic form of which can be seen today.

In the early 1990s work took place in stages to complete the missing Baglan to Lonlas section of the M4, resulting in the interchange seen today which was completed in 1993. The missing link of the M4 motorway was designed in the 1980s. The new motorway passes across the River Neath on a much higher bridge than the A48 bridge, apparently to provide clearance over a power station below. By the time the motorway was built, the power station had closed but nevertheless the motorway remained at the same level.

The Baglan to Lonlas section was built in stages, the first being the widening of the A48 between Earlswood and Lonlas. The eastbound carriageway of the A48 as it approaches the Earlswood junction remained largely unchanged, but the westbound carriageway was diverted under the line of the unbuilt motorway before rejoining the original carriageway. In the early 1990s this section of A48 was redesignated M4.

The second stage was the construction of the new M4 Briton Ferry bridge, together with a loop sliproad linking the eastbound A483 with the eastbound M4, and a second slip linking the westbound M4 with the westbound A483. This section of motorway and interchange opened in 1993, thus completing the M4 motorway between London and Pont Abraham.

Routes

Route To Notes

M4

Carmarthen / Caerfyrddin, Neath / Castell-nedd

M4

Cardiff / Caerdydd, Port Talbot

A483

Swansea / Abertawe

A48

Briton Ferry / Llansawel No access from M4 westbound



Earlswood Interchange
Related Pictures
View gallery (5)
1 mile from J42, Briton Ferry-Llansawel. This is the start of the mid-1990s section of M4 which finally closed the gap. - Coppermine - 7380.jpgAdvance signage of J42, Briton Ferry-Llansawel on the approach to the River Neath Viaduct. - Coppermine - 7379.jpgApproaching the A483 from the M4 - Briton Ferry - Geograph - 1459059.jpgGantry before J42, Briton Ferry-Llansawel, on top of the new viaduct over the River Neath. - Coppermine - 7378.jpgOn top of the new viaduct over the River Neath at J42, Briton Ferry-Llansawel. Access here is to Swansea only via the A483. - Coppermine - 7377.jpg
Junctions on the M4
Main RouteChiswick • 2 Brentford • 3 Cranford Parkway • 4 Heathrow • 4B Colnbrook • 5 Langley • 6 Tuns Lane • 7 Huntercombe • 8/9 Holyport • 10 Winnersh • 11 Three Mile Cross • 12 Theale • 13 Chieveley • 14 Wickham • 15 Plough Hill • 16 Spittleborough • 17 Stanton St Quinton • 18 Tormarton • 19 Hambrook • 20 Almondsbury • 21 Awkley • 22 Pilning • 23 Rogiet • 23A Magor • 24 Coldra • 25 Caerleon • 25A Grove Park • 26 Malpas • 27 High Cross • 28 Tredegar Park • 29 Castleton • 30 Pentwyn • 31 Junction 31 • 32 Coryton • 33 Cardiff West • 34 Miskin • 35 Pencoed • 36 Sarn • 37 Pyle • 38 Margam • 39 Groes • 40 Taibach • 41 Pentyla • 42 Earlswood • 43 Llandarcy • 44 Lon-Las • 45 Ynysforgan • 46 Llangyfelach • 47 Penllergaer • 48 Hendy • 49 Pont Abraham
Heathrow SpurCherry Lane • 4 Heathrow • 4A Concord
Former RoutesBray • 9A Cox Green • 9B The Thicket // 19 Hambrook • 19A Frenchay // 20 Almondsbury • 21 Aust • 22 Newhouse • 23 Magor // 28  Tredegar Park • 29 St Mellons
Defunct Newport
Bypass Proposal
23 Rogiet • 25 Glan Llyn • 27 Dock Way • 29 Castleton
Junctions on the A48
Highnam Roundabout • Highbeech Roundabout • Parkwall Roundabout • Coldra • Beatty Road Roundabout • Hartridge Farm Road Roundabout • Balfe Road Roundabout • Queensway Meadows Roundabout • Nash Road Roundabout • Church Street Roundabout • Maesglas East • Maesglas West • Ebbw Bridge Roundabout • Tredegar Park • St Mellons • Culverhouse Cross • Sycamore Cross • Waterton Cross • Margam • Groes • Earlswood • Lon-Las • Llangyfelach • Penllergaer • Pont Abraham • Cross Hands • Pensarn