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 Barri; Barry Island [Beach symbol] .
A fourth lane joins at junction 34 to handle the significant commuter traffic joining the M4 towards Cardiff. The next junction is where the city's outer ring road branches off.