 The £ 8 @.@ 5 million Central Link ( Welsh : Ffordd Gyswllt Canolog ) between the Queen 's Gate Roundabout ( 51 @.@ 468399 ° N 3 @.@ 157366 ° W ﻿ / 51 @.@ 468399 ; -3.157366 ﻿ ( Queen 's Gate Roundabout ) ) and the junction on Adam Street ( 51 @.@ 479557 ° N 3 @.@ 167631 ° W ﻿ / 51 @.@ 479557 ; -3.167631 ﻿ ( Adam Street Junction ) ) on the A4160 was opened on 16 February 1989 . 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 . 
