Groes Interchange

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Groes Interchange
Cyfnewidfa y Groes
Location Map ( geo)
The only slip road at M4 motorway junction 39, Margam, Port Talbot - Geograph - 2954313.jpg
Cameraicon.png View gallery (1)
Location
Groes
County
Glamorgan
Highway Authority
Welsh Government
Roads Joined
M4, A48

Groes Interchange is junction 39 of the M4 motorway. As far as the motorway is concerned, the interchange amounts to a single sliproad providing access from the A48 to the westbound carriageway of the motorway. All other movements between the M4 and the A48 are dealt with at the Margam Interchange (junction 38) which lies a kilometre or so south-southeast of Groes.

History

The roundabout at Junction 39 formed the southern terminus of the A48(M) built in the 1960s. When the M4 was extended eastwards in 1977, the eastbound carriageway was diverted first along the line of the new motorway to the new roundabout at junction 38. This enabled the original eastbound carriageway to the roundabout to be removed and the westbound realigned as a slip road. It was around this time that the A48(M) was renumbered to M4.

Routes

Route To Notes

M4

Swansea / Abertawe

A48

Port Talbot, Hospital

A48

Cardiff / Caerdydd

A48(M)

Swansea / Abertawe



Groes Interchange
Related Pictures
View gallery (1)
The only slip road at M4 motorway junction 39, Margam, Port Talbot - Geograph - 2954313.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
Future Route23 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