 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 . 
