|Location Map ( geo)|
|Power cables and railway bridge crossing the gyratory|
|SSE of Abergavenny|
|A40, A465, A4042, B4598|
|Junctions related to the A4042|
|Caerleon Interchange • Court Farm Roundabout • Cwmbrân Roundabout • Edlogan Way Roundabout • Grove Park Interchange • Pontypool Roundabout|
The Hardwick Gyratory (unnamed on signs), a major interchange situated close to Abergavenny in south-east Wales, is the only junction in Wales to have trunk roads radiating from it in more than four directions.
In 1922 the site was home to a simple fork junction – lying immediately to the west of the more southerly of the two railway bridges which today span the site – between the A471 and the B4245 (which had become the A4125 by the end of the 20s). In 1935, the A4042 was extended over the A4125, and the A40 was diverted from its original route between Ross and Abergavenny by way of Skenfrith to run instead via Monmouth, Raglan, and this junction.
One year later, in 1936, the A4042-A465 North-South route from Newport to Hereford was trunked, using the A40 north of this junction to link the two. The A40 route was trunked in 1946, as was the A465 west of Abergavenny town centre.
The junction became a roundabout in 1962, when the A465 Heads of the Valleys road (since dualled at this point) was diverted to it via a southern bypass of Abergavenny. Then, in the early 1970s, a new eastern bypass of the town was opened from here, taking the northbound A465 along a route on the eastern side of the railway line. With the A40 from Raglan having in the meantime been upgraded to follow a new alignment (the old route becoming the B4598), there were now six routes converging on Hardwick – five of them on trunk roads – necessitating a major expansion of the junction between them all. This was accomplished by constructing a large "balloon" extension of the eastern side of the original roundabout, incorporating a second underpass of the railway about 140 metres north of the first bridge, and the result was today's gyratory system.
Despite plans to grade-separate the rest of the Heads of the Valleys route, none exist as yet for any alteration to this junction, its eastern terminus.
|Abergavenny / Y Fenni, Brecon / Aberhonddu|
|Raglan / Rhaglan, Monmouth / Trefynwy, The Midlands (M4, M50)||Hereford avoiding low bridge / i osgoi pont isel|
|Hereford||Height restriction / Cyfyngiad uchder 4.4m / 14'3" in 12 miles / mewn 12 milltir|
|Merthyr Tydfil / Merthyr Tudful||For B4246 Llanfoist / Llan-ffwyst Fawr, Blaenavon / Blaenafon|
|Pontypool / Pontypŵl, Cwmbrân, Newport / Casnewydd|
|Clytha, Usk / Brynbuga||Light vehicles only / Cerbydau ysgafn yn unig|