|Location Map ( geo)|
|Distance:||7.3 miles (11.7 km)|
|Now part of:||B4275|
|Route outline (key)|
It appears to have terminated at the junction with what is now the A4233, then the B4277, and the A4059 before it was rerouted onto the Aberdare bypass. It ran parallel to the A4059 for most of its length, as well as starting and finishing on that road.
The route was originally part of the A4059, with the B4275 roughly following the route of the modern A4059. The A4224 number and the re-routing of the A4059 is not shown on the 1969 OS Quarter Inch of the area, but is shown on the 1971 revision, thus giving a close approximation of the creation date.
The situation lasted until the new crossing of the Cynon at Cwmbach and the associated new roads were constructed circa 1990, at which point the A4224 was downgraded once more.