Motorway gantry sign
A gantry spanning the motorway with blue overhead signs indicating one lane exiting and two continuing ahead, and the following text.
Left lane destinations: A48 Llansawel; Briton Ferry A483 Abertawe; Swansea .
Right-hand two lanes destinations: Caerdydd; Cardiff; Port Talbot M4 .
Junction number: 42.
This bit of the M4 started out as part of the A48, built as a dual carriageway bypass in the 1950s, and substantially improved over the years. There are three lanes between junctions 43 and 42, after which we climb onto a high bridge dating from the 1990s that was built to bypass the worst of the old 1950s road.