A blue sign with a diagram showing a branch off the road ahead and the following text.
Forward destinations: Caerdydd; Cardiff.
Exit destinations: Casnewydd; Newport; A48; Risca; Brynmawr; A467.
Junction number: 28.
This junction marks the end of the 1967-built Newport Bypass. From here the M4 across South Wales was built a bit at a time during the 1970s and early 80s. The next section to Cardiff arrived in 1977.