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The A4118 starts at Dyfatty Street in Swansea city centre at the junction with the A483 Carmarthen Road, which is just north of Swansea railway station. It then goes westwards through the town centre. It passes through Mount Pleasant and Uplands before reaching Sketty, where having passed the parish church of St Pauls and Holy Trinity, it crosses the A4216.
Road Junction where the A4118 meets the B4271
After passing through Killay and Upper Killay, where the B4271 branches off to the right, the A4118 turns towards the southwest and leaves the main urban area of Swansea and the scenery becomes more rural. The road crosses Fairwood Common, where Swansea Airport can be seen on the right, and after turning westward the road becomes more scenic with Pennard Castle and the links course of Pennard Golf Club visible to the left. It then passes through the villages of Parkmill, Penmaen and Knelston. Here the road swings round to the south and passes through the village of Llandewi. The B4247 to Rhossilli branches off to the right and the A4118 descends to the coast.
A4118
A483
A4216
