Castleton Interchange

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Castleton Interchange
Gyffordd Cas-bach
Location Map ( geo)
M4, J29 - Geograph - 3672006.jpg
Cameraicon.png View gallery (7)
Location
Castleton
County
Monmouthshire
Highway Authority
Welsh Government
Junction Type
Fork
Roads Joined
M4, A48(M)

Castleton Interchange forms junction 29 of the M4 and is a limited access free-flow junction with the A48(M) Cardiff Spur.

History

The interchange was opened in two sections. M4 junctions 28 to 29 and the A48(M) spur (including the bridge carrying the eastbound A48(M) over the future M4) was opened in October 1977. On that day, work officially started on the construction of M4 junctions 29 to 32, which was officially opened in July 1980.

Abandoned Carriageway

Running parallel and adjacent to the westbound carriageway of the A48(M) is a section of abandoned carriageway. There was a school of thought which said that this was the original eastbound carriageway of the A48(M) running directly onto the M4, however there is no evidence to support this. Later research on the SABRE forums suggests that this section of carriageway was built as a temporary diversion for the wstbound carriageway during maintenance work.


Routes

Route To Notes

M4

Cardiff (N & W)/Caerdydd (G a Gn), Bridgend/Pen-y-bont

M4

Newport/Casnewydd

A48(M)

Cardiff (E & S)/Caerdydd (Dn a D)

M4

London/Llundain, Bristol/Bryste, Newport (S)/Casnewydd (D) Unbuilt route south of Newport



Castleton Interchange
Related Pictures
View gallery (7)
M4J29 2014.jpgM4 Junction 29 looking westbound at the A48(M) diverge - Coppermine - 12075.jpgM4 Toll - Coppermine - 144.JPGM4 eastbound at junction 29 - Geograph - 520273.jpgM4 westbound at junction 29 - Geograph - 520298.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