Camera 5205 (at the 320.5km mark)
Above the eastbound M4, Pont Abraham J49

Camera 5190 (at the 319.0km mark)
Above the westbound M4, Dyffryn Farm

Camera 145/5164 (at the 316.4km mark)
Above the westbound M4, J48 (Hendy)

Camera 146/5103 (at the 310.3km mark)
Beside the eastbound M4, between bridges of J47 (Penllergaer)

Camera 147/5074 (at the 307.4km mark)
Above the eastbound M4, J46 (Llangyfelach)

Camera 148/5042 (at the 304.2km mark)
Above the eastbound M4, J45 (Ynysforgan)

Camera 149/5012 (at the 301.2km mark)
Way above the eastbound M4, J44 (Lon Las)

Camera 150/038(sic)
Above the westbound M4 to the east of J44 (Lon Las)

Camera 151/4984 (at the 298.4km mark)
Beside the eastbound M4 and exit slip of J43 (Llandarcy)

Camera 152/4973 (at the 297.3km mark)
Above the eastbound M4 and exit slip of J42 (Earlswood)

Camera 153/4960 (at the 296.0km mark)
Above the westbound M4 and exit slip of J42 (Earlswood)

Camera 154/4948 (at the 294.8km mark)
Above the eastbound M4, between J42 and J41 (Earlswood and Pentyla)

Camera 156/4914 (at the 291.4km mark)
Above the westbound M4, J41 (Pentyla)

Camera 157/4900 (at the 290.0km mark)
Above the westbound M4 on the gantry over the eastbound Gatso at J40 (Taibach)

Camera 158/4888 (at the 288.9km mark)
Above the westbound M4 just south of J40 (Taibach)

Camera 159/4884 (at the 288.4km mark)
High above the eastbound M4, between J39 and J40 (Groes and Taibach)

Camera 160/4875 (at the 287.5km mark)
Above the westbound M4, west of J39 (Groes)

Camera 161/4864 (at the 286.4km mark)
Above the eastbound M4, east of J39 (Groes)

Camera 171/4827 (at the 282.7km mark)
Above the westbound M4 on the viaduct between J37 and J38 (Pyle and Margam)

Camera 4789 (at the 278.9km mark)
Above the westbound M4, J37 (Pyle)

Camera 4748 (at the 274.8km mark)
M4 westbound between junctions 36 and 37 (Sarn and Pyle)

Camera 4728 (at the 272.8km mark)
Above the eastbound M4, just after the Court Colman overbridge

Camera 4719 (at the 271.9km mark)
Above the eastbound M4, west of J36 (Sarn)

Camera 164 (near the 270.4km mark)
Beside the westbound M4, J36 (Sarn)

Camera 4685 (at the 268.5km mark)
Above the westbound M4, just before J36 (Sarn)

Camera 165 (near the 264.2km mark)
Above the eastbound M4, J35 (Pencoed)

Camera 187/4530 (at the 253.0km mark)
Above the eastbound M4, between J34 (Llantrisant) and J33 (Cardiff West)

Camera 185/4516 (at the 251.6km mark)
Above the westbound M4, just after J33 (Cardiff West)

Camera 167
Beside the westbound M4, above the A4232 to Cardiff West at J33 (Cardiff West)