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J37/38 W
(Pyle and Margam)

J38 E
(Margam)

J40/38 E
(Taibach and Margam)

J39/40 W
(Groes and Taibach)

J40/38 E
(Taibach and Margam)

J41/42 W
(Pentyla and Earlswood)

J42/41 E
(Earlswood and Pentyla)

J42 W
(Earlswood)

J42 E
(Earlswood)

J43 E
(Llandarcy)

J44/45 W
(Lon Las and Ynysforgan)

J44 E
(Lon Las)
Images from Traffic Wales website.