Tourist exit sign
A brown sign with an arrow pointing diagonally up and left, and the following text.
Bae Caerdydd; Cardiff Bay; Amgueddfa; Werin Cymru ; Museum of; Welsh Life [Museum symbol] Ynys y Barri; Barry Island [Fairground or theme park symbol] .
The services are at the next junction, and so are a whole range of attractions - not just Cardiff's main tourist sites, but also the bright lights of Barry.