Lon-Las Interchange

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Lon-Las Interchange
Cyfnewidfa Lôn-las
Location Map ( geo)
Junction 44 of the M4 - Geograph - 905586.jpg
Cameraicon.png View gallery (2)
Location
Lon-las
County
Glamorgan
Highway Authority
Welsh Government
Junction Type
Modified Roundabout Interchange
Roads Joined
M4, A48, A4230, B4291
Junctions related to the A4230
Aberdulais Interchange

Lon-Las Interchange is junction 44 of the M4. It was built in its present form in 1972 and formed the eastern terminus of the M4 Morriston bypass. The main line continued eastwards as the A48 to where it joined the 1955-built A48 Neath bypass just to the north of the now-demolished A48 railway bridge.

Although superficially it is a grade separated two bridge roundabout interchange, it differs from most as a result of the eastbound on-slip exiting the roundabout on the inside.

When the A48 was upgraded to M4 in 1993, the interchange remained unchanged.

Routes

Route To Notes

M4

Llanelli, Carmarthen / Caerfyrddin

M4

Neath / Castell-nedd, Port Talbot, Cardiff / Caerdydd

A48

Llansamlet, Morriston / Treforys, Swansea (East) / Abertawe (Dwyrain)

A4230

Skewen / Sgiwen

B4291

Birchgrove, Clydach (B4290) Signed as B4290

B4625

Heol Las, Swansea Vale / Bro Abertawe, DVLA Swansea Local Office / Swyddfa Leol Abertawe DVLA Route number unsigned

A48(M)

Llanelli, Carmarthen / Caerfyrddin

Links



Lon-Las Interchange
Related Pictures
View gallery (2)
Advance signage for J44, Lon-las. This junction has a bizarre sliproad arrangement for the eastbound entry. - Coppermine - 7387.jpgJunction 44 of the M4 - Geograph - 905586.jpg
Other nearby junctions
SwanseaEarlswood Interchange • Llangyfelach Interchange • Penllergaer Interchange • Ynysforgan Interchange
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