 The Cogan Spur , which is also known as the Cogan Link ( Welsh : Gyswllt Cogan ) , from the Ferry Road Interchange ( 51 @.@ <unk> ° N 3 @.@ <unk> ° W ﻿ / 51 @.@ <unk> ; <unk> ﻿ ( Ferry Road Interchange ) ) to Barons Court Junction ( 51 @.@ <unk> ° N 3 @.@ <unk> ° W ﻿ / 51 @.@ <unk> ; <unk> ﻿ ( Barons Court Junction ) ) on the A4160 was opened in 1988 . 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 . 
