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Gabalfa Interchange

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Gabalfa Interchange
Location Map ( geo)
Subway under Gabalfa Interchange, Cardiff - Geograph - 2759060.jpg
Subway under the Gabalfa Interchange
Cameraicon.png View gallery (5)
Highway Authority
Welsh Government
Junction Type
Three-Level Stacked Roundabout
Roads Joined
A48, A469, A470
Junctions related to the A48
Church Street Roundabout (Newport) • Culverhouse Cross roundabout • Highnam Roundabout • Pont Abraham Interchange • Tredegar Park Interchange • Groes Interchange • Pentyla Interchange • Sycamore Cross • Earlswood Interchange • Margam Interchange • Lon-Las Interchange • Llangyfelach Interchange • Penllergaer Interchange • Parkwall Roundabout • Beatty Road Roundabout • Hartridge Farm Road Roundabout • Balfe Road Roundabout • Queensway Meadows Roundabout • Maesglas East • Maesglas West • Waterton Cross • Fairoak Interchange • St Mellons Junction • Mynachdy Interchange • Coldra Interchange • Pensarn Roundabout • Cross Hands Roundabout • Coedkernew Junction • Nash Road Roundabout • Pont Ebbw Roundabout • Highbeech Roundabout
Junctions related to the A470

Gabalfa Interchange is a major three level junction located in the northern suburbs of Cardiff. It appears that the name of the junction comes from the area it is situated within, which originally comes from Gabalva House that was situated on the site of the present day estate (source: A Vision of Britain through Time)


Original plan for the junction along with an improved A470

Bigger things were planned for the junction when originally designed. In 1966 Buchanan published a transportation report into future road proposals for the city. This would see two important roads cross at Gabalfa, an improved A470 and a new inner bypass which was opened as Eastern Avenue. A three level interchange was planned to connect these roads. The original plan was to grade separate the A470 north of Gabalfa which would have meant the loss of houses on the eastern side of the road. South of Gabalfa the flyover was to curve eastwards onto a new dual carriageway to the city centre.

In 1968 the A470 plans were shelved, possibly due to the heavy loss of property, and a slight alteration was made to the planned junction. The flyover was retained but would now tie into the existing road network. At its northern end a one way system was created and the southern end was built straighter which descends onto North Road. The roundabout was now to have an extra arm serving the A469 which originally was to be replaced by the link to the city centre. Eastern Avenue was built as planned and this took the A48 number.

The junction as built (top) with the unbuilt Llantrisant Radial

Another element of the junction was the Llantrisant Radial. This would have joined the A48 to the west. The close proximity of the junctions meant C/D lanes were planned to reduce weaving. Gabalfa Interchange was built before the Llantrisant Radial and to help reduce later costs the west facing slips were built on a splay. This is so the retaining walls would not have to be replaced at great cost when the Llantrisant Radial was built. The Llantrisant Radial was later scrapped so the splay was not needed but the extra long slip roads can still be seen as a legacy of greater plans that never saw the light of day.


Route To Notes


M4 (E), Newport, University Hospital


Cardiff (W), Cardiff Airport


M4 (W)


Roath A469 number is not signed

Gabalfa Interchange
Related Pictures
View gallery (5)
Mynachdy Interchange River Route.pngMynachdy Interchange Buchanan Route.pngA470 Northern Avenue upgrade.pngPublic art on Eastern Avenue, Cardiff - Geograph - 1990643.jpgSubway under Gabalfa Interchange, Cardiff - Geograph - 2759060.jpg
Other nearby junctions

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