A blue sign with a diagram showing a branch off the road ahead and the following text.
Forward destinations: Caerdydd (G & Gn); Cardiff (N & W); Pen-y-bont; Bridgend.
Exit destinations: Caerdydd (Dn); Cardiff (E); A4232.
Junction number: 30.
This is the eastern end of Cardiff's incomplete ring road, the A4232. We'll meet it again on the far side of the city, but it doesn't yet join up properly and it's not clear that it ever will.