Motorway gantry sign
A gantry spanning the motorway with blue overhead signs indicating two lanes exiting and two continuing ahead, and the following text.
Left-hand two lanes destinations: A470 Merthyr Tudful; Merthyr Tydfil; Caerdydd; Cardiff .
Right-hand two lanes destinations: Caerdydd (Dn); Cardiff (E); Casnewydd; Newport M4 .
Junction number: 32.
A fourth lane opens up as we approach junction 32. The A470 isn't just the main road into Cardiff from the north, it's the main north-south road running the length of Wales. This southern bit, from here towards Merthyr, may as well be a motorway.