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 A4119 near Gilfach Road bridge | ||||
| Route information | ||||
| Length | 19.5 mi (31.4 km) | |||
| History | Construction completed 1995 | |||
| Major junctions | ||||
| Northwest end | Colliers Way,Tonypandy 51°37′26″N3°27′13″W / 51.6240°N 3.4537°W /51.6240; -3.4537 (A4119 road (northwestern end)) | |||
| Major intersections |  A4058 A4233 A4093 A473 M4 Jnc. 34 A4054 A48 A470 | |||
| Southeast end | Bute Place,Cardiff Bay 51°27′54″N3°09′53″W / 51.4649°N 3.1646°W /51.4649; -3.1646 (A4119 road (southeastern end)) | |||
| Location | ||||
| Country | United Kingdom | |||
| Constituent country | Wales | |||
| Primary destinations | Cardiff | |||
| Road network | ||||
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TheA4119 linksTonypandy withCardiff inSouth Wales.
The A4119 starts outside theWales Millennium Centre atCardiff Bay and proceeds throughButetown,Grangetown,Riverside andCathedral Road inCanton until meeting theA48 road (Western Avenue) atLlandaff.From here it proceeds through Llandaff passing the formerBBC Wales studios. After leaving Llandaff the road takes on a more rural setting with many bends crossing the M4 Motorway near Capel Llanitern. From here the road snakes past the settlement ofCreigiau.
The road enters theCounty Borough ofRhondda Cynon Taf (formerlyMid-Glamorgan) atGroes-faen. The road continues through the Village until it comes to a T-Junction at The Castell Mynach Public House. To the left is a Spur of the A4119 that links to Junction 34 of theM4 Motorway. Off the roundabout at the Junction is theRenishaw Plant (formally owned byBosch.)
The road continues after the t-junction past Miskin and Mwyndy.
The A4119 through Talbot Green was first built circa 1977[citation needed] as a single carriageway passing to the side of the village straight on to Ely Valley Road, easing pressure off the original small lanes that lead from Talbot Green to the area known as Mwyndy, south of the village. The road here was built at the same time as an extension of the original Talbot – Cardiff road, leading to Junction 34 of theM4 Motorway, and creating better access to the lanes leading to theVale of Glamorgan.At Mwyndy Cross, you can still see the original lane that the road used, signposted "Arthur Llewelyn Jenkins", the lane is accessible to the furniture store and as far as Cefn-y-Parc cemetery but is blocked at the bypass.There is a roundabout with theTalbot Green Bypass after passing Mwyndy Cross and the original roads – the A473 Pontypridd to Bridgend Road. This roundabout was added when the bypass was built in 1991 and was improved during mid 2016 to mid 2017 to add extra dedicated lanes and a traffic lighting system. Another roundabout, was located at the base of Llantrisant, where the A473 originally ran. When the bypass was built, it cut off the original main road fromCowbridge viaPontyclun and therefore traffic is forced to use the new Bypass.
The decision was made byMid-Glamorgan County Council in the early 1990s to dual the section of A4119 between Ynysmaerdy and Mwyndy. This would be the last major road project undertaken by Mid-Glamorgan before its abolishment in 1996.[citation needed]
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The completed "Talbot Green to Ynysmaerdy Dual Carriageway" officially opened on 28 July 1995.[citation needed] The scheme replaced the old Roundabout near Llantrisant with a four way traffic-lit junction, and completely replaced the original Ely Valley Road at Talbot Green apart from the first portion: a t-junction from the centre Talbot Green's high street that leads to a row of houses and a Golf Club, this is the only remaining section Ely Valley Road that is un-altered, still bearing the original road surface and signage,[citation needed] although it is now aCul-de-sac.
At the next roundabout the road takes the shape of a bow passed the Ely Meadows which is now the site of Magden Park, a development of Offices, Hotel, Pub and private Health facility.[1] Bypassing theRoyal Glamorgan Hospital,Avionics department ofBritish Airways and the Headquarters of the Welsh Blood Service.
On the south-bound carriageway is a long stretch of original road, although now a parking area where refreshment vans and sleepy truckers are a common sight, it provides access to some houses and a rural lane leading to Llantrisant.
The Road then comes to a roundabout with a turn-off for the Llantrisant Industrial Park, which is home to theRoyal Mint.
Another smaller roundabout at the village of Ynysmaerdy, where the new Headquarters of theSouth Wales Fire and Rescue Service is located.[2]
Past Ynysmaerdy the dual carriage way climbs a hill, which is known locally as "Stink Pot Hill" because of the sewerage works that are on the side of the road.[citation needed]. This was originally a single carriageway road but in August 2022, construction started to upgrade it to dual carriageway and in March 2025, it was completed.
At the next roundabout the road splits, this is where a bypass separates from the original course of the A4119 and from this point on the road is once again single carriageway. The old road through the village ofCoed-Ely is to the right. The bypass, completed in 1987, takes the route of the old Ely Valley Railway, and the former site of the Coed-Ely Colliery is on the left. From here the road is still single carriageway with numerous rest areas. The road continues on another bypass pastTonyrefail.Shortly after Tonyrefail the road once again forks, with a junction for the A4233 which links withTrebanog andPorth. The A4119 from here follows the floor of the Valley through woodland and past a small industrial estate with the Village ofWilliamstown. At this roundabout, the A4119 meets momentarily with its original course before continuing along the old Railway line. The route then bypasses the village ofPenygraig and south ofTonypandy, where is progresses down a steep incline. There is a spur withClydach Vale before the road, still following an old railway line, progresses down to the floor of the valley where the A4119 ends with a roundabout of the A4058.Originally the A4119 continued along Colliers Way and Llwynypia Road, where it again followed its original course, to a Terminus atLlwynypia Hospital with theA4058, but following the completion of the Porth Relief Road, the roads were re-numbered. Therefore, Colliers Way and the Tonypandy North Bypass are now part of the A4058Pontypridd toTreorchy route.
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51°31′41″N3°22′01″W / 51.5281°N 3.3670°W /51.5281; -3.3670 (A4119 road)
