Motorway lane allocation sign
A blue sign with a diagram showing the left lane exiting and three others continuing, and the following text.
Left lane destinations: Gorllewin; Caerdydd ; Cardiff West; Barri; Barry; Penarth; A4232 [Airport symbol].
Right-hand three lanes destinations: Caerdydd; Cardiff; M4.
Junction number: 33.
From here the A4232 is a fast expressway that will take you right into Cardiff Bay. It's meant to be a ring road, and we'll meet it again on the other side of Cardiff, but it doesn't yet join up in the middle.