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While analyses of morphology suggest a close relationship between Homarinus and Homarus , molecular analyses using mitochondrial DNA reveal that they are not sister taxa . Both genera lack ornamentation such as spines and carinae , but are thought to have reached that state independently , through convergent evolution . The closest living relative of Homarus is Nephrops norvegicus , while the closest relatives of Homarinus are Thymops and Thymopides .
= A4232 road =
The A4232 , which is also known either as the Peripheral Distributor Road ( PDR ) ( Welsh : Ffordd Ddosbarthu Ymylol ) or the Cardiff Link Road ( Welsh : Ffordd Gyswllt Caerdydd ) , 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 the first phase of the final link road , the Eastern Bay Link Road , started on 17 March 2016 and is due to be completed by April 2017 . When fully completed , the road will form part of the Cardiff ring road system . 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 ) . 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 = =
The road was conceived in the early 1970s and planning began in the late 1970s , by South Glamorgan County Council . The road at that stage was planned to be completed by 1995 and would relieve 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 ) . 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 .
The former chairman of the South Glamorgan County Council environment committee , Councillor Paddy Kitson , called the road a " necklace of opportunity " due to its shape and also the opportunities for regeneration . By 1 April 1996 the responsibility for the road was transferred from South Glamorgan County Council to 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 . However , since the completion of the Butetown Link Road , funding for further developments have been at a stand still , and to date 22 kilometres ( 14 mi ) including spurs are open to traffic with plans for a further 5 @.@ 53 km ( 3 @.@ 44 mi ) . The " missing link " , the Eastern Bay Link Road , is still to be built .
= = 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 ) .
The 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 ( Welsh : Ffordd Gyswllt Gorllewin ) , is 15 @.@ 77 kilometers ( 9 @.@ 80 mi ) in length and includes the Capel Llanilltern – Culverhouse Cross Link Road , Ely Link Road , Grangetown Link Road and Butetown Link Road . For the majority of this section it is the boundary between the City of Cardiff to the east and the Vale of Glamorgan to the west .
This section partly opened in 1978 , 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 .
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 .
= = 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 = = =
The GB £ 14 @.@ 5 million Capel Llanilltern – Culverhouse Cross Link Road ( Welsh : Ffordd Gyswllt Capel Llanilltern – Croes Cwrlwys ) , also known as the A4232 Trunk Road ( as it is the only section of the PDR which is a trunk road ) , between the Capel Llanilltern Interchange ( 51 @.@ 506481 ° N 3 @.@ 310425 ° W  / 51 @.@ 506481 ; -3.310425  ( Capel Llanilltern Interchange ( M4 J33 ) ) ) and the Culverhouse Cross Interchange ( 51 @.@ 466350 ° N 3 @.@ 271110 ° W  / 51 @.@ 466350 ; -3.271110  ( Culverhouse Cross Interchange ) ) was opened in 1985 . It was designed to provide a by @-@ pass for traffic from the M4 to the Vale of Glamorgan . It is 5 @.@ 47 km ( 3 @.@ 40 mi ) in length and includes the Ely Viaduct close to Michaelston @-@ super @-@ Ely . The trunk road is maintained by the South Wales Trunk Road Agency ( SWTRA ) on behalf of the Welsh Assembly Government ( WAG ) . The remainder of the PDR is a primary route , which is maintained by Cardiff Council . In 2006 variable message signs 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 .
= = = = Ely Viaduct = = = =
The Ely Viaduct ( Welsh : Traphont Trelái ) crosses over the River Ely and also the main South Wales railway line .
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 .
= = = Ely Link Road = = =
The Ely Link Road ( Welsh : Ffordd Gyswllt Trelái ) between the Culverhouse Cross Interchange ( 51 @.@ 465840 ° N 3 @.@ 269895 ° W  / 51 @.@ 465840 ; -3.269895  ( Culverhouse Cross Interchange ) ) and the Leckwith Interchange ( 51 @.@ 470641 ° N 3 @.@ 211762 ° W  / 51 @.@ 470641 ; -3.211762  ( 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 ) . It was designed to relieve Ely of through traffic and partly cuts into Leckwith Hill .
= = = Grangetown Link Road = = =
The 2 @.@ 89 km ( 1 @.@ 80 mi ) Grangetown Link Road ( Welsh : Ffordd Gyswllt Trelluest ) between the Leckwith Interchange ( 51 @.@ 470159 ° N 3 @.@ 211239 ° W  / 51 @.@ 470159 ; -3.211239  ( Leckwith Interchange ) ) and the Ferry Road Interchange ( 51 @.@ 453510 ° N 3 @.@ 185760 ° W  / 51 @.@ 453510 ; -3.185760  ( Ferry Road Interchange ) ) was opened on 3 May , 1988 . It includes the Grangetown Viaduct .
= = = = Grangetown Viaduct = = = =
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 . It has 13 spans of 71 meters ( 233 ft ) with 2 end spans of 38 m ( 125 ft ) and 46 m ( 151 ft ) .
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 .
= = = Butetown Link Road = = =
The 2 @.@ 57 km ( 1 @.@ 60 mi ) Butetown Link Road ( Welsh : Ffordd Gyswllt Butetown ) between the Ferry Road Interchange ( 51 @.@ 453585 ° N 3 @.@ 184044 ° W  / 51 @.@ 453585 ; -3.184044  ( Ferry Road Interchange ) ) and the Queen 's Gate Roundabout ( 51 @.@ 467873 ° N 3 @.@ 157455 ° W  / 51 @.@ 467873 ; -3.157455  ( Queen 's Gate Roundabout ) ) was opened on 27 March , 1995 by Neil Kinnock at the time the European Commissioner for Transport . 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 .
In 1987 South Glamorgan County Council had intended to build a viaduct cross the River Taff and then go onto an elevated section through Butetown " on stilts " . But the newly formed Cardiff Bay Development Corporation along with local residents objected to the scheme that they said would cut through Butetown and split the community , creating an unnecessary physical barrier between the two areas to the north and south of the link road . By 1988 South Glamorgan County Council had agreed to change the design of the link road , despite having already spent 6 years of design work on the link road meant that a tunnel had to be built instead . 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 .
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 , Davies Middleton & Davies Ltd have subsequently gone into administrative receivership .
= = = = Queen 's Gate Tunnel = = = =
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 ) 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 .
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 .
= = = = Taff Viaduct = = = =
Construction of the 600 m ( 2 @,@ 000 ft ) Taff Viaduct ( Welsh : Traphont Tâf ) includes a dual @-@ carriageway roadway plus a foot and cycle path . South Glamorgan County Council was the local authority in charge of the project at the time and construction of the viaduct began in March , 1991 . The Taff Viaduct crosses the River Taff at Cardiff Bay .
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 .
= = = Eastern Bay Link Road = = =
Construction began on 17 March 2016 on the 5 @.@ 25 km ( 3 @.@ 26 mi ) Eastern Bay Link Road ( Welsh : Ffordd Gyswllt Ddwyreiniol y Bae ) which 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 ( 51 @.@ 468090 ° N 3 @.@ 156193 ° W  / 51 @.@ 468090 ; -3.156193  ( Queen 's Gate Roundabout ) ) and Ocean Way Interchange . ( 51 @.@ 472328 ° N 3 @.@ 144107 ° W  / 51 @.@ 472328 ; -3.144107  ( Ocean Way Interchange ) ) The link road will be a two lane dual carriageway with a 50 miles per hour ( 80 km / h ) speed limit .
For many years this link road has been mothballed due to the costs involved . 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 . Later it became known as the Cardiff Bay Link Road , then renamed the Eastern Bay Link Road .
The 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 . 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 , although a public @-@ private partnership is also possible .
The original route of the link road had been challenged by both Friends of the Earth Cymru , and also the Royal Society for the Protection of Birds ( RSPB ) , who had both lodged formal objections against the link road . 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 roundabout . 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 .
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 . 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 . The overall objectives of the road would be to :
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
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 . Construction of this first phase of the Eastern Bay Link Road is due to begin in 2015 and will take 18 months to complete . In April 2015 , it was announced by the Welsh Government that the 1 @.@ 2 km £ 27.3m Eastern Bay Link Road from the incomplete flyover at the Queens Gate roundabout to the Ocean Way roundabout at Tremorfa known as the " roundabout to nowhere " , would be designed by Capita Property and Infrastructure and constructed by Dawnus Construction Holdings and Ferrovial Agroman UK in a joint venture . Construction began on the link road on 17 March 2016 .
= = = Southern Way Link Road = = =
The Southern Way Link Road ( Welsh : Ffordd Gyswllt y Ffordd Deheuol ) , 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 . 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 . In 1987 it was envisaged that the present single @-@ carriage would be " twinned " as a dual @-@ carriageway , the same as the rest of the PDR . The 2 @.@ 25 km ( 1 @.@ 40 mi ) link road now runs from the Rover Way – Lamby Way Roundabout ( 51 @.@ 493127 ° N 3 @.@ 133759 ° W  / 51 @.@ 493127 ; -3.133759  ( Rover Way – Lamby Way Roundabout ) ) to the Llanedeyrn Interchange ( 51 @.@ 507202 ° N 3 @.@ 145853 ° W  / 51 @.@ 507202 ; -3.145853  ( Llanedeyrn Interchange ) ) on the A48 .
= = = = East Moors Viaduct = = = =
The 900 m ( 3 @,@ 000 ft ) East Moors Viaduct ( Welsh : Traphont Rhostiroedd y Dwyrain ) , 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 . The viaduct was constructed by concrete box girder deck of segmental construction . The East Moors Viaduct was originally known as the East Moors Link Road – Phase 2 , but now forms part of the Southern Way Link Road .
= = = Pentwyn Link Road = = =
The Pentwyn Link Road ( Welsh : Ffordd Gyswllt Pentwyn ) , which is also known as the North Pentwyn Link Road , runs from the Pontprennau Interchange ( 51 @.@ 528660 ° N 3 @.@ 130240 ° W  / 51 @.@ 528660 ; -3.130240  ( Pontrennau Interchange ) ) on the A48 and the Pentwyn Interchange ( 51 @.@ 541525 ° N 3 @.@ 128749 ° W  / 51 @.@ 541525 ; -3.128749  ( Pentwyn Interchange ( M4 J30 ) ) ) 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 . 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 .
= = Public Art & Commemorative Stones = =
= = Spur roads = =
= = = Cogan Spur ( A4055 ) = = =