Penllergaer Interchange

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Penllergaer Interchange
Cyfnewidfa Penlle'r-gaer
Location Map ( geo)
M4 eastbound at junction 47 - Geograph - 4346636.jpg
Cameraicon.png View gallery (1)
Location
Penllegaer
County
Glamorgan
Highway Authority
Welsh Government
Junction Type
Roundabout Interchange
Roads Joined
M4, A48, A483
Junctions related to the A483
Croesfoel Interchange • Crossgates roundabout • Earlswood Interchange • Gresford Interchange • Halton Roundabout • Johnstown Interchange • Llandeilo Roundabout • Llynclys Crossroads • Mile End Roundabout • Mold Road Interchange • Pont Abraham Interchange • Rossett Interchange • Ruabon Interchange • Ruthin Road Interchange • Sarn Bryn Caled Roundabout • The Old Station roundabout • Wrexham Road Interchange

The Penllegaer Interchange, junction 47 of the M4, was built in 1977 as part of the M4 Pontardulais bypass contract. It is a grade separated roundabout situated above the M4 and is junction 47 of that road.


History

Prior to construction of the M4, the A48, A483 and A484 met at a roundabout about 400m south west of the interchange, with the A48 taking the northern and eastern arms, the A483 the southern arm, and the A484 the western arm. As part of the M4 works, the A483 was diverted to the east of Penllegaer to the new interchange site, and the remaining southern stub was downgraded to unclassified status.

The Penllegaer interchange roundabout lies to the north of the orignal line of the A48, which can be identified clearly in Google aerial photography. Whilst the bridges over the line of the new motorway were being built, eastbound A48 traffic was diverted down the westbound on-slip, across the line of the new motorway, up the eastbound off-slip, round the far side of the roundabout, then making another trip down and up the east facing slip roads before rejoining the line of the A48.

The Swansea West service area on the north side of the roundabout was built many years later than the rest of the interchange.


Routes

Route To Notes

M4

Carmarthen / Caerfyrddin

M4

Cardiff / Caerdydd, Neath / Castell-nedd

A48

Gorseinon, Penllergaer, Pontlliw (A484)

A48

Llangyfelach, Morriston Hospital / Ysbyty Treforys, Penllergaer Business Park / Parc Busnes Penllergaer, Council offices / Swyddfeydd y cyngor

A483

Swansea / Abertawe, Swansea West Ind. Est. / Yst. Ddw Gorllewin Abertawe, Airport / Maes Awyr, Park and Ride / Parcio a Theithio Yst. Ddw is a signwriter's mistake for Yst. Ddiw.

Swansea West services

Swansea West services Gwasanaethau Gorllewin Abertawe



Penllergaer Interchange
Related Pictures
View gallery (1)
M4 eastbound at junction 47 - Geograph - 4346636.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