|Location Map ( geo)|
|Modified 3-level stacked roundabout|
|Llantrisant Radial, Western Tangential|
|Junctions related to the A48(M) (Llantrisant Radial)|
|Cardiff West Interchange • Mynachdy Interchange|
Radyr Interchange was a planned junction that ultimately would connect the Llantrisant Radial to the Western Tangential. The Llantrisant Radial would be built many years in advance of the Western Tangential so the junction would initially be a Diamond interchange serving the A4119. However things are complicated due to there being two alternative routes for the Llantrisant Radial. These were known as the Buchanan Route and the River Route. The Buchanan Route would have ran to the north and the diamond interchange there would close when the Western Tangential opened. The River Route would have ran further south and the bridge carrying the diamond interchange would have formed the western side of a new roundabout interchange. The River Route was eventually chosen shortly before the entire plan was scrapped.
Despite first appearances from the map, there would never have been two Llantrisant Radials running parallel - it was either one or the other. For the Buchanan Route there would have been two junctions on the Western Tangential at the locations shown with the southern junction being a diamond where it crosses the A4119.
|M4 (E), City centre|
|Merthyr Tydfil (A470)|