The existing site is a terrible location, it may well be on the A48 but it affects all surrounding areas of Heath, Cathays and Roath. It would be far better to build alongside the M4 and have access from the motorway to serve an expanding Cardiff for years to come. Llandough serves the Vale and is not at all ideally placed. Junction 33 and 32 offer the best options in my opinion. Then do something with the original CRI to serve the south of Cardiff.