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A4232 road

A4232 road shield

A4232 road
Route information
Length: 12.2 mi (19.6 km)
Existed: 1978[1] – present
History: Constructed 1978–1995
Major junctions
West end: [ M 4  ] M4 motorway (J33)
  A48 A48 road
A4050 A4050 road
A4055 A4055 road
A4234 A4234 road
A4161 A4161 road
A48 A48 road
East end: [ M 4  ] M4 motorway (J30)
Road network

The A4232, which is also known either as the Peripheral Distributor Road (PDR) ([3][4] is a distributor road in Cardiff, the capital of Wales.

The first section of the PDR to be completed was the Southern Way Link Road in 1978 and the last section was the Butetown Link Road in 1995. Construction of a section of the final link road, the Eastern Bay Link Road, is due begin in 2015, and will take approximately 18 months to complete. When fully completed, the road will form part of the Cardiff ring-road system.[5] The PDR runs west, south and east of Cardiff, with the M4 between junction 30 and junction 33 completing the northern section. The PDR is dual carriageway for its entire length except for the East Moors Viaduct, which is a single carriageway.

The PDR has been constructed in separate link roads of between 1.61 km (1.00 mi) and 5.47 km (3.40 mi) around Cardiff and to date 22 kilometres (14 mi) including spurs have been opened to traffic, with plans for a further 5.53 km (3.44 mi).[6] It has 4 large viaducts (Ely Viaduct, Grangetown Viaduct, Taff Viaduct and the East Moors Viaduct), 1 tunnel (Queen's Gate Tunnel) and 2 spur roads (Cogan Spur and Central Link Road). The road also has many smaller bridges over or under most of the interchanges on the road. The entire length of the road has clearway restrictions on it.


  • History 1
  • Route description 2
  • Link roads 3
    • Capel Llanilltern – Culverhouse Cross Link Road 3.1
    • Ely Link Road 3.2
    • Grangetown Link Road 3.3
    • Butetown Link Road 3.4
    • Eastern Bay Link Road 3.5
    • Southern Way Link Road 3.6
    • Pentwyn Link Road 3.7
  • Spur roads 4
    • Cogan Spur (A4055) 4.1
    • Central Link Road (A4234) 4.2
  • Abandoned spur roads 5
    • Ely Spur 5.1
    • Cardiff Airport Link Road 5.2
  • Services 6
  • Traffic congestion 7
  • Popular culture 8
  • See also 9
  • Notes 10
  • References 11
  • External links 12


The road was conceived in the early 1970s and planning began in the late 1970s, by Ely, Grangetown, Butetown and East Moors of through traffic and as a fast link to the national motorway network via the M4 and A48(M).[7] The first section of the PDR to be completed was the Southern Way Link Road between Newport Road (A4161 road) and the Eastern Avenue (A48 road) in 1978 and the last section of the PDR, the Butetown Link Road, was opened to the public in 1995.[1][2]

The former chairman of the unitary authority of Cardiff Council. Much of the funding for the road had been grant aided from the European Community and the UK Government on the basis that it would improve the economic viability of the area and bring in new jobs and industry.[1] However, since the completion of the Butetown Link Road, funding for further developments have been at a stand still,[2] and to date 22 kilometres (14 mi) including spurs are open to traffic with plans for a further 5.53 km (3.44 mi).[6] The "missing link", the Eastern Bay Link Road, is still to be built.[2]

Route description

The PDR has 3 separate sections; the Capel Llanilltern Interchange (M4 J33) to Queen's Gate roundabout, the Rover Way – Lamby Way roundabout to the Llanedeyrn Interchange (A48) and the Pontprennau Interchange (A48) to the Pentwyn Interchange (M4 J30).

Stone marking the inauguration of Queen's Gate (Butetown Link Road) at the Queen's Gate roundabout

This section from the Capel Llanilltern Interchange on the M4 (junction 33) to the Queen's Gate roundabout is sometimes referred to as the Western Link Road (Vale of Glamorgan to the west.

Clockwise exits Junction / Interchange Anti-Clockwise exits
Bridgend, Newport, M4
Exit only
M4 J33
Cardiff West services
Start of A4232
No access or exit Museum of Welsh Life
Culverhouse Cross Cardiff West A48
Barry A4050
Clockwise exits Junction / Interchange Anti-Clockwise exits
Cardiff West A48
Barry A4050
Culverhouse Cross
B4267, City Centre Industrial area B4267
Cardiff City Stadium
Barry A4055
Penarth (A4160)
Barry A4055
Penarth (A4160)
No Exit Techniquest, Museum
Start of A4232 Queen's Gate roundabout Road terminates at roundabout
City centre, Atlantic Wharf A4234
Docks, Porth Teigr, Cardiff Bay
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

This section partly opened in 1978,[1] from the Rover Way – Lamby Way roundabout to the Llanedeyrn Interchange on the A48 is oldest section of the PDR. It includes only the Southern Way Link Road, known locally as Southern Way, and is 2.25 km (1.40 mi) in length.

Clockwise exits Junction / Interchange Anti-Clockwise exits
Lamby Way
End of A4232
Rover Way / Lamby Way Start of A4232
A4161, City centre
Exit only
Southern Way Access only
Start of A4232 Llanedeyrn A48, Newport, City Centre
End of A4232
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

The Pentwyn Link Road section from the Pontprennau Interchange on the A48 to the Pentwyn Interchange on the M4 (junction 30) is one of the newer sections of the PDR, having been opened in 1984, it is 1.61 km (1.00 mi) in length. The road between the Llanedeyrn Interchange to the Pontprennau Interchange is the A48 (Eastern Avenue), it too is a dual carriageway and is a concurrent road with the PDR, there are no plans to renumber this section of the A48.

Clockwise exits Junction / Interchange Anti-Clockwise exits
A48 A48 Pontprennau Start of A4232
Pontprennau, Cardiff Gate Retail Park,
Llanedeyrn Village
Heol Pontprennau Pontprennau, Cardiff Gate Retail Park,
Llanedeyrn Village
Start of A4232 M4 J30
Pentwyn Interchange
Cardiff Gate services
Bridgend, Newport, M4
End of A4232
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Link roads

A map of all the link roads and spur roads can be seen by clicking Map of all coordinates opposite

Each section of the road was completed in separate link roads.

Capel Llanilltern – Culverhouse Cross Link Road

Capel Llanilltern – Culverhouse Cross Link Road
Looking north towards the M4
Ely Viaduct

The GB£14.5 million Capel Llanilltern – Culverhouse Cross Link Road (

  • Capel Llanilltern Junction (A4232 and M4 J33)
  • South of Capel Llanilltern
  • North of St Brides-super-Ely
  • South of St Brides-super-Ely
  • St Fagans Slip Road

The following images updates every five minutes – click ‘refresh’ for the latest.

Webcams on the Capel Llanilltern – Culverhouse Cross Link Road
  • Map of the Ely Viaduct on the Capel Llanilltern - Culverhouse Cross Link Road
  • City & County of Cardiff Local Transport Plan 2000 - 2016, Cardiff Council, August 2000
  • A Change of Gear (Green Paper), Cardiff Council, December 2002
  • Keeping Cardiff Moving (White Paper), Cardiff Council, May 2003
  • South Wales Trunk Road Agency website
  • Traffic Wales website
  • Photo of Grangetown Viaduct being built
  • Cardiff Council information on the Queen's Gate Tunnel
  • A4232 road on Facebook

External links

  • Cardiff & Newport A-Z Street Atlas 2007 Edition


  1. ^ a b c d e f g h i j South Wales Echo, "Opening up southern Cardiff – Value of PDR", Wednesday 22 May, 1985, Page 15
  2. ^ a b c d "Keeping Cardiff Moving".  
  3. ^ "Transportation Cardiff Link road".  
  4. ^ "Course Fishing Venues in Vale of Glamorgan Wales". David Wells Retrieved 2008-03-08. 
  5. ^ "Ring Roads". Paul Berry. Archived from the original on 9 November 2007. Retrieved 2008-03-08. 
  6. ^ a b c d e f "Local Transport Plan 2000–2016".  
  7. ^ a b c d South Wales Echo, "A direct route on stilts to the Bay", Wednesday 17 June 1987, Page 14
  8. ^ a b "Development is putting a strain on distributor road...and on commuters". icWales. Retrieved 2008-02-02. 
  9. ^ "The A4232 Trunk Road (Capel Llanilltern – Culverhouse Cross, Cardiff)".  
  10. ^ "The Road Network managed by the Agency". South Wales Trunk Road Agency. Retrieved 2008-03-11. 
  11. ^ "What is Traffic Wales?".  
  12. ^ "Technology Achievements". Techspan Systems. Retrieved 2011-03-24. 
  13. ^ "Post-Tensioned Segmental Construction" (PDF). The Aberdeen Group. Retrieved 2008-04-13. 
  14. ^ a b "Cardiff Timeline". Retrieved 2007-08-15. 
  15. ^ a b c d "Cardiff Timeline". Cardiff Council. Archived from the original on 29 September 2007. Retrieved 2007-08-15. 
  16. ^ Bridge Management: Inspection, Maintenance, Assessment and Repair Papers by Keith Harding, G.A.R. Parke & M.J. Ryall. Retrieved 2008-03-08. 
  17. ^ a b Structural Assessment: The Role of Large and Full-Scale Testing By K. S. Virdi. Retrieved 2008-03-08. 
  18. ^ a b South Wales Echo, "Delay to link road will be at least one year", Tuesday 16 February 1988, Page 5
  19. ^ South Wales Echo, "A road that lost its way?", Wednesday 29 March 1989, Page 12
  20. ^ "Retaining a major share of the home market". Reed Business Information Limited. Retrieved 2008-02-05. 
  21. ^ a b "Butetown Tunnel". EIWHS Ltd. Archived from the original on 4 February 2008. Retrieved 2008-02-05. 
  22. ^ a b "Infrastructure". MJ Civil Engineering. Retrieved 2008-03-05. 
  23. ^ "A Private View". CBAT, now called Public Art Wales. Retrieved 2008-03-08. 
  24. ^ "Peripheral Distributor Road in Cardiff".  
  25. ^ "Greenfield sites need protection".  
  26. ^ a b "Cardiff Transportation Partnership". Cardiff Council. Retrieved 2008-03-08. 
  27. ^ "Trying to squeeze us out of rush-hour car seats". icWales. Retrieved 2008-03-08. 
  28. ^ "Transport Campaigners Welcome Much Needed Shift in Assembly Funding Priorities".  
  29. ^ "Eastern Bay Link, Cardiff".  
  30. ^ a b "Cardiff Local Development Plan 2006-2021- Preferred Strategy Report paragraph 6.24". Cardiff Council. Retrieved 2008-02-01. 
  31. ^ "Delivering the Deliverable". Cardiff Council. Retrieved 2008-03-08. 
  32. ^ "'"Plans for major new link road and railway station in Cardiff 'have Government support.  
  33. ^ a b "Eastern Bay Link: Queensgate to Ocean Way".  
  34. ^ "The procurement to deliver the A4232 Eastern Bay Link project".  
  35. ^ "First phase of vital road linking the Bay to the east of Cardiff to get underway next year".  
  36. ^ """Report of the Chief Regulatory Services Officer Page 21, reference to "Southern Way Link (PDF).  
  37. ^ "Southern Way flyover closure expected to cause disruption". Media Wales Ltd. Retrieved 2009-06-01. 
  38. ^ a b Bridge Deck Behaviour by Edmund C. Hambly. Retrieved 2008-03-08. 
  39. ^ "Awards". Benaim (UK) Ltd. Archived from the original on 11 February 2008. Retrieved 2008-02-01. 
  40. ^ "M4 in Wales. Castleton to Coryton (J29 to J32) – Interchanges". The Motorway Highway Trust. Retrieved 2008-03-08. 
  41. ^ a b "Construction starts at Sports Village". Cardiff Council. Retrieved 2008-02-13. 
  42. ^ "Sports Village Roads Works Plan Revealed". Retrieved 2008-02-13. 
  43. ^ Structural Integrity Assessment By Peter Stanley. Retrieved 2008-03-08. 
  44. ^ a b """The A48/A4232 Culverhouse Cross and Airport Access Study "The Way Forward.  
  45. ^ "Cardiff West".  
  46. ^ "Cardiff Gate".  
  47. ^ "North and West Cardiff – Area Transport Study". Vale of Glamorgan Council. Retrieved 2008-03-08. 
  48. ^ "Everything Changes". Retrieved 2008-03-07. 
  49. ^ a b "The Runaway Bride". Retrieved 2008-03-07. 
  50. ^ "Doctor Who: The Runaway Bride". BBC. Retrieved 2008-03-07. 


See also

The Queen's Gate Tunnel was featured in the first ever episode of Torchwood, called "Everything Changes" and was first broadcast by BBC Three on 22 October 2006.[49] The Grangetown Link was featured in the 2006 Christmas episode of Doctor Who called "The Runaway Bride".[50][51] It was first broadcast by BBC One on 25 December 2006.[50]

Popular culture

Since the western link roads were built, a number of major developments have been built, such as the Cardiff Bay Retail Park, Cardiff International Sports Village and the Cardiff City Stadium, which includes the Capital Retail Park. On 18 October, 2006, the council requested that the WAG assess the existing traffic conditions and future growth in traffic on the network.[48]

Traffic congestion

Traffic Wales is the Welsh Government's traffic information service, it is a partnership between the Welsh Government, the two Trunk Road Agents (South Wales TRA / Norh & Mid Wales TRA) and the WTTC consultancy Amey. In South Wales the service is managed from the South Wales Traffic Management Centre, also home to INRIX Media's studio, providing live travel information for the media. The Traffic Wales website has five live traffic webcams on the Capel Llanilltern – Culverhouse Cross Link Road (Trunk Road) and the images are updated every 5 minutes. Traffic Wales also operates a Traffic Information Hotline, motorists can use this telephone service by dialling an 0845 number, which gives up to date traffic information and travel advice.

The PDR has two service stations for motorists, one at Cardiff West on the Capel Llanilltern Interchange and the other at Cardiff Gate on the Pentwyn Interchange. The services at Cardiff West includes Esso petrol, a Travelodge, Burger King, Costa Coffee and W H Smith,[46] while the services at Cardiff Gate includes petrol, Burger King, W H Smith and also Coffee Primo.[47]


One of the 4 proposed schemes involved a new major highway route linking the Ely Link Road (PDR), south of the Culverhouse Cross Interchange, through to the A4226 north of Barry. The estimated cost of this scheme would have been £96m, including the widening of the A4232.[45]

The Cardiff Airport Link Road (Barry to Cardiff and is the main commuter route.

The A4050 road

Cardiff Airport Link Road

The Ely Spur was planned to run from a new interchange on the Ely Link Road to Ely Bridge on the A48. It was only 1.2 km (0.75 mi) in length, but it would have reduced through traffic in the residential area of Ely, namely on Cowbridge Road West traveling to and from the A48. But it has now been announced that this proposal has now been officially abandoned.[30]

Ely Spur

Abandoned spur roads

The £8.5 million Central Link (Welsh: Ffordd Gyswllt Canolog) between the Queen's Gate Roundabout () and the junction on Adam Street () on the A4160 was opened on 16 February 1989.[1][15] When it was first opened it only linked Cardiff city centre with Cardiff Bay. It was not until the Butetown Link was opened on 27 March 1995 that this road started to be used as a link to the motorway network, Penarth and the Vale of Glamorgan. It will not be until the Eastern Bay Link is built, when traffic from the city centre will use it to travel east, that it will be fully used. The length of the A4234 is just 1.45 km (0.90 mi) and is entirely a two lane dual carriageway with clearway restrictions.

A4234 at the junction of Adam Street

Central Link Road (A4234)

The Cogan Viaduct (Welsh: Traphont Cogan) is the most important element of the Cogan Spur as it crosses the River Ely with a central span of 95 metres (312 ft). In total it has 6 spans; 40 m (130 ft), 60 m (200 ft), 60 m, 60m, 95 m and 60 m.[17] It is made from a multi-span glued segmental structure of rectangular box sections. In all over 300 sections were used to construct the viaduct, each weighing from 43 to 117 tonnes.[22][43] The Cogan Viaduct was again designed by South Glamorgan County Council, who won a Concrete Society Commendation in 1989 for the design.

Cogan Viaduct

The most recent development, which began at the end of 2006 and into 2007 was the widening of the road between the Cogan Viaduct and the Ferry Road Interchange to a 3-lane dual-carriageway. A new junction was also built for the Cardiff International Sports Village directly from Cogan Spur; also the Barons Court roundabout was replaced by a signal controlled crossroad. The main contractor for this project was Laing O'Rourke Civil Engineering.[41][42]

The Cogan Spur, which is also known as the Cogan Link (Welsh: Gyswllt Cogan),[41] from the Ferry Road Interchange () to Barons Court Junction () on the A4160 was opened in 1988.[14] It is only 0.8 km (0.50 mi), but it is an important link to provide access to the PDR from Penarth and the southern part of the Vale of Glamorgan. It also bypasses Penarth Road (A4160) for traffic going in and out of Cardiff city centre.

Cogan Viaduct

Cogan Spur (A4055)

Spur roads

The Pentwyn Link Road (Welsh: Ffordd Gyswllt Pentwyn), which is also known as the North Pentwyn Link Road, runs from the Pontprennau Interchange () on the A48 and the Pentwyn Interchange () on the M4 (junction 30). It is 1.61 km (1.00 mi) in length and was opened by John Redwood MP, the Secretary of State for Wales on 20 June, 1994.[15] It provides a link between the Eastern Avenue (A48) and the M4 so that westbound traffic from the east of the city can get onto the M4 without having to go through the city, via the A48 and A470. In addition it also provides access to the community of Pontprennau to the national road network. This link was financed by private developers as part of a large scale housing development at Pontprennau.[40]

Pentwyn Link Road
Stone marking the opening of the Pentwyn Link
Approaching the Pontprennau roundabout

Pentwyn Link Road

The 900 m (3,000 ft) East Moors Viaduct (Welsh: Traphont Rhostiroedd Ddwyrain),[37] which is also known as the Southern Way Flyover, was also designed by Robert Benaim and Associates who won the ICE (Institution of Civil Engineers) Project Award and also a Concrete Society Commendation, both in 1985 for work on the viaduct.[38][39] The viaduct was constructed by concrete box girder deck of segmental construction.[38] The East Moors Viaduct was originally known as the East Moors Link Road – Phase 2,[1] but now forms part of the Southern Way Link Road.

East Moors Viaduct

The Southern Way Link Road (Welsh: Ffordd Gyswllt Ffordd Deheuol),[36] generally known simply as Southern Way, was built in two parts; the first section of Southern Way to be completed was between Newport Road (A4161 road) and the Eastern Avenue (A48 road) in 1978.[1] The final section of the link road was built between Newport Road and the Rover Way – Lamby Way roundabout and was opened in 1984 at a cost of £9 million and includes the East Moors Viaduct, which is also known as the Southern Way Flyover.[1] In 1987 it was envisaged that the present single-carriage was would be "twinned" as a dual-carriageway, the same as the rest of the PDR.[7] The 2.25 km (1.40 mi) link road now runs from the Rover Way – Lamby Way Roundabout () to the Llanedeyrn Interchange () on the A48.

East Moors Viaduct
Southern Way Flyover

Southern Way Link Road

On 2 May 2014, Edwina Hart approved the procurement of the design–build contractor, advance service diversion works and communications arrangements for the Eastern Bay Link Road.[34] Construction is due to begin in 2015 and will take 18 months to complete.[35]

  • Increase accessibility from east Cardiff to major employment sites in the East Moors area, Cardiff Bay and the Central Cardiff Enterprise Zone
  • Provide a more direct route between the Butetown Tunnel and Rover Way
  • Reduce congestion at the junctions on Tyndall Street by removing traffic currently using the Ocean Way- East Tyndall Street – Central Link route
  • Reduce journey times for private and commercial road users
  • Help economic regeneration
  • Enhance road safety and reduce casualties
  • Improve resilience on the strategic road network around Cardiff
  • Provide more opportunities for cycling and walking[33]

It was revealed on 14 June 2013 that Edwina Hart, Minister for Economy, Science and Transport in the WAG supported the completion the Eastern Bay Link Road.[32] She said that the link road would; improve access to Cardiff Bay, improve access to the Cardiff Central Enterprise Zone and enhance connections within the Cardiff City Region.[33] The overall objectives of the road would be to:

Rover Way
Rhymney River flows close to Rover Way
Celsa Steel's Castle Works (right) and Sims' scrap yard (left)

The original route of the link road had been challenged by both Friends of the Earth Cymru,[28] and also the Royal Society for the Protection of Birds (RSPB), who had both lodged formal objections against the link road.[29] However, the current proposal from Cardiff Council of 31 October 2006 is to complete the first phase of the road, approximately 1 km (0.62 mi) in length, from the Butetown Link Road to Ocean Way Interchange. The new route would be a different route from the earlier proposal and would avoid any encroachment into the nature conservation area, which Friends of the Earth and the RSPB had objected to. Therefore the new route of the link road should ensure that there are no objections.[30][31]

The proposed Eastern Bay Link Road, along with other schemes have been subject to many planning proposals since the last link road (the Butetown Link Road) was finished in 1995, namely a local transport plan (Local Transport Plan 2000–2016) in August 2000, a green paper (A Change of Gear) in December 2002 and a white paper (Keeping Cardiff Moving) in May 2003.[6][26] The cost of the link road was estimated to cost GB£162 million in 2001 and this increased to GB£180 million by August 2002. It could be paid for by congestion charging,[27] although a public-private partnership is also possible.[26]

The incomplete flyover at Queen's Gate Roundabout which would form the start of the Eastern Bay Link Road.

The link road had previously been known as the East Moors Link Road – Phase 1 and 3, but it also included the East Moors Viaduct, which was originally known as the East Moors Link Road – Phase 2.[1] Later it became known as the Cardiff Bay Link Road, then renamed the Eastern Bay Link Road.[7]

It is envisaged that the 5.25 km (3.26 mi) Eastern Bay Link Road (Welsh: Ffordd Gyswllt Ddwyreiniol y Bae) will run from the Queen's Gate Roundabout to the Rover Way – Lamby Way Roundabout on the Southern Way Link Road, although at present only the first phase between Queen's Gate Roundabout () and Ocean Way Interchange () is officially at the planning stage.[24] For many years this project has been mothballed due to the costs involved.[25]

Proposed route of the Eastern Bay Link Road

Eastern Bay Link Road

South Glamorgan County Council also commissioned a sculpture by Kevin Atherton for the foot and cycle path on a specially constructed viewing platform. The work was to mark the completion of the Taff Viaduct so that the sculpture, called A Private View, should be visible for the benefit of pedestrians, cyclist and motorists alike.[23]

Sculpture on the Taff Viaduct

The viaduct was constructed using precast concrete segments, which is widely used in the construction industry for medium to long span viaducts. Segments were made in a casting yard near the site and then transported for final assembly of the viaduct.[22]

Construction of the 600 m (2,000 ft) Taff Viaduct (River Taff at Cardiff Bay.

Taff Viaduct
During construction
Spanning the River Taff

Taff Viaduct

South Glamorgan County Council originally awarded the contract for the management, installation, testing and commissioning of all electrical and mechanical services for the tunnel, and the water pumping stations to EI·WHS Ltd. They still maintain the tunnel on behalf of Cardiff Council.[21]

The Queen's Gate Tunnel (Welsh: Twnnel Porth y Frenhines), also known as the Butetown Tunnel, is underneath southern Butetown and follows a line underneath the Wales Millennium Centre. The 715 m (2,346 ft)[21] twin tunnel was constructed using the cut and cover method of construction, which involves digging a trench for the tunnel and then roofing it over. The tunnel was constructed using reinforced concrete and a central wall separates the two sets of traffic.[18]

Construction of the
Queen's Gate Tunnel
During the "cover" phase of the "cut and cover" method of construction

Queen's Gate Tunnel

The contract to build the Butetown Link Road was eventually won by a local company Davies Middleton & Davies Ltd in a joint venture with an Italian contractor, Cogefar-Impresit UK Ltd. The bid of £60 million undercut all other bids by £10 million,[20] Davies Middleton & Davies Ltd have subsequently gone into administrative receivership.

[19] The cost of the Butetown Link Road was estimated to cost £35 million, but this had risen to £45M in 1988, before the design change.[18] In 1987 South Glamorgan County Council had intended to build a viaduct cross the

The 2.57 km (1.60 mi) Butetown Link Road (Welsh: Ffordd Gyswllt Butetown) between the Ferry Road Interchange () and the Queen's Gate Roundabout () was opened on 27 March, 1995 by Neil Kinnock at the time the European Commissioner for Transport.[15] Construction of the link road commenced on 15 October 1993 and it was the last link road to be built. It includes the Taff Viaduct, also known as the Butetown Link Road Bridge, and the Queen's Gate Tunnel, which is also known simply as the Butetown Tunnel.

Queen's Gate Tunnel
Butetown Tunnel

Butetown Link Road

The viaduct was designed by South Glamorgan County Council. Robert Benaim and Associates, now called Benaim UK Ltd designed the initial launching system for the glued segmental structure.

The Grangetown Viaduct (Welsh: Traphont Trelluest) is approximately 1 km (0.62 mi) in length and is said to be the longest glued segmental bridge in the United Kingdom.[16] It has 13 spans of 71 meters (233 ft) with 2 end spans of 38 m (125 ft) and 46 m (151 ft).[17]

Grangetown Viaduct

The 2.89 km (1.80 mi) Grangetown Link Road (Welsh: Ffordd Gyswllt Trelluest) between the Leckwith Interchange () and the Ferry Road Interchange () was opened on 3 May, 1988.[15] It includes the Grangetown Viaduct.

Grangetown Link Road
Grangetown Viaduct over Penarth Road (A4160)

Grangetown Link Road

The Ely Link Road (Welsh: Ffordd Gyswllt Trelái) between the Culverhouse Cross Interchange () and the Leckwith Interchange (), sometimes referred to as the Leckwith Road Interchange. It is 4.83 km (3.00 mi) in length and was opened in 1982 and built by Davies Middleton & Davies Ltd (DMD).[14] It was designed to relieve Ely of through traffic and partly cuts into Leckwith Hill.[6]

Footbridge on the Ely Link Road, connecting Mary Immaculate High School to Caerau

Ely Link Road

The viaduct is a 538 ft (164 m) twin-box girder and has central span of 230 ft (70 m) and 150 ft (46 m) side spans, constructed by the balanced cantilever method. It was constructed in segments each weighing between 54 tons for plain segments to 93 tons for the main segments.[13]

The Ely Viaduct (Welsh: Traphont Trelái) crosses over the River Ely and also the main South Wales railway line.

Ely Viaduct

[12][11] were installed on the Capel Llanilltern – Culverhouse Cross Link Road by Techspan Systems to display messages giving motorists warning of road and weather conditions, accidents, congestion and major events held in the area.variable message signs, which is maintained by Cardiff Council. In 2006 primary route The remainder of the PDR is a [10][9] (WAG).Welsh Assembly Government. The trunk road is maintained by the South Wales Trunk Road Agency (SWTRA) on behalf of the Michaelston-super-Ely It is 5.47 km (3.40 mi) in length and includes the Ely Viaduct close to [6]

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