77) M4 Motorway

The M4 Motorway runs on a raised section right through the town. As you can see from the sketch - and I made this one on a Sunday afternoon, hence the lack of traffic - from Margam right through the town the M4 only has two lanes on each carriageway. It's fair to say that this causes a LOT of congestion, and for a while a couple of years ago a couple of junctions leading to and from the town on the Motorway were actually closed at peak time. Didn't seem to work. 

When I first moved here, Port Talbot was the place where the M4 suddenly and abruptly ended, to begin again a couple of miles west of the town. The linking section was finally opened in the mid 1990s.