|Location Map ( geo)|
|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|
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.
|Carmarthen / Caerfyrddin, Neath / Castell-nedd|
|Cardiff / Caerdydd, Port Talbot|
|Swansea / Abertawe|
|Briton Ferry / Llansawel||No access from M4 westbound|