The A470 dual carriageway at Pontypridd.
|Length:||186 mi (299 km)|
| A4119 road
The A470(T) is a major long-distance road in Wales, from Cardiff on the south coast to Llandudno on the north coast. It is 186 miles (299 km) long, with, at times, a tortuous route through the country's mountainous central region, including the Brecon Beacons and Snowdonia National Park.
It is a primary trunk route throughout its length, and the southernmost 26 miles (42 km), from Cardiff Bay to Merthyr Tydfil, is mainly direct and good quality dual carriageway, but most of the route from north of Merthyr Tydfil to Llandudno is single carriageway of variable quality (and even for short distances single track) to negotiate the mountainous landscape. It passes through several town centres, right-angle (or tighter) divergent junctions and sharp curves.
Route in detail 
The southernmost point of the route is at The Flourish, Cardiff Bay, outside the Wales Millennium Centre. It runs up Lloyd George Avenue (this was previously Collingdon Road, and the A470 previously ran along the parallel Bute Street), and continues along St. Mary Street in central Cardiff. The road then becomes North Road, and after a tidal flow system running to Maindy and then goes over the flyover at the Gabalfa interchange of the A48 and the A469. It becomes an urban dual-carriageway along Manor Way and Northern Avenue, with a 40 mph (64 km/h) speed limit and with many traffic-signalled crossings. It passes without interruption under the M4 at the giant Coryton roundabout. For the next 15 miles (24 km) it is a modern high-speed dual carriageway by-passing Tongwynlais and Castell Coch, Taff's Well, to Pontypridd. Heading north to Abercynon, the road now follows the route of the Taff Vale Railways Llancaiach Branch to Quakers Yard roundabout, where it is joined by the A4059 from Abercynon, Aberdare and Hirwaun ; the A472 from Ystrad Mynach and Pontypool finally the A4054 from Quakers Yard, and Merthyr Tydfil.
From Quakers Yard roundabout (locally known as 'Fiddlers Elbow'), 5.5 miles (8.9 km) of dual carriageway takes the road to the Pentrebach roundabout where the A4060 links, and then to the Merthyr Tydfil roundabout where the road meets the A465 and the dual carriageway ends. A twisting section alongside the Taf Fawr reservoirs of Llwyn-on, Cantref and Beacons takes the road to its highest point at Storey Arms on the pass over the Brecon Beacons before a long descent down to the town of Brecon. This marks the northernmost point of the "traditional" A470.
The remainder of the route north of Brecon consists of older routes now renamed 'A470'. This artificiality is apparent as a driver following the entire route north to south must diverge from the main line of respective stretches of road no fewer than five times. A short three lane stretch heads north east before a sharp left turn is required to stay on the road. From this point on the road becomes narrow and twisting and overtaking is problematic except at a few straight sections. Another sharp left turn at a stop sign in Llyswen takes the road alongside the River Wye into Builth Wells.
The road continues to follow the Wye to the busy crossroads where it meets the A44 in the centre of Rhayader. On reaching Llangurig, a right turn outside the village takes the road past Llanidloes and through Llandinam, the birthplace of David Davies and now the headquarters of Girl Guides Wales. Another anomalous left turn at a railway crossing sets the path for Caersws, Carno and Llanbrynmair. Just beyond the village of Talerddig the road descends and crosses under the Shrewsbury-Aberystwyth railway line. The long descent towards Commins Coch is a relatively new stretch of road that replaced a record breaking set of road-works that had traffic light controlled single lane working for over 10 years because of unstable ground conditions. The river bridge at Commins Coch is so narrow and set at such an angle that only one vehicle at a time can pass. At Cemmaes Road the road joins the A487 at a roundabout. A right turn at the roundabout takes the road on to Mallwyd where the A458 joins at yet another roundabout.
The country becomes more forested and the road climbs up through Dinas Mawddwy and then steeply up the eastern foot-hills of Cadair Idris before dropping down through tortuous bends to the Dolgellau by-pass. More sharp twists and turns in the forestry and through the village of Ganllwyd brings the road up onto the high plateau of the Cambrian dome where the road follows the ancient track of Sarn Helen Roman road passing the redundant nuclear power station at Trawsfynydd. A right turn beyond the power station takes the road on to Ffestiniog and Blaenau Ffestiniog before heading over the Crimea Pass to Dolwyddelan. A sharp left turn interrupts the A470 as it becomes the A5 for a short distance towards Betws-y-Coed before turning right again back onto the A470 just before Waterloo Bridge. Passing down the valley of the River Conwy the road passes through Llanrwst, Tal y Cafn and Glan Conwy, at which point there is a dual roundabout that intersects with the A55 North Wales Expressway before descending into Llandudno. The northernmost point of the route is in Llandudno itself at the sea front, where it meets the North Shore Parade, the A547.
History of numbering of the A470 
From Cardiff to Brecon was the original A470. It originally ran into Brecon town centre and joined the A40 road. The old A470 between the by-pass and the town, along Newgate Street, is now the B4601. A4062 was the number for the section from the junction of the A40 and the B4601 – the Brecon (eastern) bypass to B4602 section. The B4601 was originally the A40 which ran through the town of Brecon. Similarly, the B4602 was originally the westernmost part of the A438.
The A438 was the original number for the road from the junction with B4602 to the sharp left turn where A470 turns north in the vicinity of Llanfilo. The A438 continues on from there to Hereford and Tewkesbury. From north of Llanfilo to Llyswen was the A4073. A479 originally linked the A40 west of Crickhowell to the A44 road at Rhayader. The A479 now runs only from Crickhowell to Llyswen. The stretch from Rhayader to Llangurig was the A44. Officially, this is now part of the A470, but some local signage shows A44/A470.
From Llangurig to Moat Lane (east of Caersws), it was once part of the A492, which originally ran from Llangurig to Newtown. The section Moat Lane to Newtown has since been renumbered A489, and from Moat Lane to Glantwymyn the A470 replaced the A489 which ran all the way from Machynlleth to the A49 road north of Craven Arms in south Shropshire. Now the A489 designation applies to two roads separated by 17 miles (27 km) of the A470. The stretch between Glantwymyn to Mallwyd was called the A4084.
Originally starting at the Cross Foxes near Dolgellau the A458 now runs only from Mallwyd to Shrewsbury. It now starts at Mallwyd with the Mallwyd to Cross Foxes section being the A470. Cross Foxes to near Gellilydan (in the Meirionydd part of Gwynedd south of Ffestiniog) brings us to a complicated series of route renumbering. This stretch was originally the A487 which ran through Dolgellau town centre. The modern A470 bypasses the town using the line of the old Ruabon – Morfa Mawddach railway. The A487 number applies to two sections of the Fishguard – Bangor trunk road with the A470 between Dolgellau and Gellilydan.
Gellilydan via Llan Ffestiniog to Blaenau Ffestiniog (Congl-y-Wal) was not originally allocated a number. The section from Blaenau Ffestiniog to Betws-y-Coed was the B4407, and from there to Llandudno was the A544. By 1946, the A496 had become extended to Llandudno.
The section of road from Glan Conwy corner to Llandudno is a new well aligned direct route to Llandudno. The old A496 has been renumbered A547 between Glan Conwy and Llandudno Junction and A546 between Llandudno Junction and Llandudno. The A496 now numbers only the Dolgellau – Blaenau Ffestiniog coast road.
|Northbound exits||Junction||Southbound exits|
|(M4 (E)), Newport, University Hospital, Cardiff West, Cardiff Airport A48||Gabalfa Interchange||End of A470 (T)|
|Start of A470 (T)||(M4 (E)), Newport, University Hospital A48|
|Cross Inn Junction||Thornhill A469|
|Taff's Well A4054
|Taff's Well Interchange||Tongwynlais A4054
|Trefforest Ind. Est. A4054
|Nantgarw Interchange||Taff's Well A4054
|Rhydyfelin A4054||Upper Boat Interchange||Trefforest Ind. Est. A4054|
|Treforest Interchage||Access only|
|Pontypridd, Rhondda Valleys A4058
|Ynsangharad Interchange||Access only|
|Access only||Bridge Street Interchange||Pontypridd A4223
Rhondda Valleys (A4058)
|Abercynon Junction||Access only|
Ystrad Mynach A472
|Quakers Yard Roundabout||Ystrad Mynach A472
|Pentrebach Roundabout||Pentrebach A4060
|Town centre, Rhyd-y-car A4102||Merthyr Roundabout||Town centre, Rhyd-y-car A4102|
|Gellideg Roundabout||Cyfartha A4102
|Hirwaun, Neath, Abergavenny, Cefn Coed y Cymmer A465||Cefn-Coed Roundabout||Hirwaun, Neath, Abergavenny A465|
A470 - Other uses of the name 
- the name of a Welsh language drama programme. This programme can be found on the Welsh-language channel S4C.
- the name of a Welsh-language onine Welsh football fanzine.
- was the name of a video and photo exhibition in 2001.
- the name of a bi-monthly magazine, subtitled What’s On In Literary Wales, containing commentary and up-to-date news of events.
- the title of a Welsh language pop song.
- the name of a metal band from Wales
- the Welsh psych group Soft Hearted Scientists had a song called the A470 song, the theme being about wanting to get out of the city and into the nature of the Welsh countryside.
- ""The Nelson branch" by Edward A. Evans. Pages 12-17". Backtrack 1996 Volume 10. Retrieved 2009-03-14.
- Ordnance Survey (1923). "MOT Map". Retrieved 16 April 2012.
- "1:250,000 Road Map". Ordnance Survey. Retrieved 16 April 2012.
- "One Inch Seventh Series". Ordnance Survey. Retrieved 26 May 2012.
- Ordnance Survey (1923). "MOT Map Sheet 11". Retrieved 16 April 2012.
- Ordnance Survey (1946). "Ten Mile Map of Great Britain". Retrieved 16 April 2012.
- "The A470: free of motels and road movies". BBC News. 2001-03-25. Retrieved 2010-04-23.
- "Picture gallery: A470 exhibition". BBC News. 2001-03-25. Retrieved 2010-04-23.