M4 J44 Lôn-las Interchange Route M4 Name Lôn-las Interchange Highway Authority Welsh Government Location type Non-standard interchange
M4 J43 Llandarcy Interchange Route M4 Name Llandarcy Interchange Highway Authority Welsh Government Location type Roundabout Interchange
M4 J42 Earlswood Interchange (West) Route M4 Name Earlswood Interchange (West) Highway Authority Welsh Government Location type Fork
M4 J42 Earlswood Interchange (East) Route M4 Name Earlswood Interchange (East) Highway Authority Welsh Government Location type Non-standard interchange
M4 Neath Bridge Route M4 Name Neath Bridge Highway Authority Welsh Government Location type Watercourse
M4 J41 Pentyla Interchange (West) Route M4 Name Pentyla Interchange (West) Highway Authority Welsh Government Location type Fork
M4 J41 Pentyla Interchange (East) Route M4 Name Pentyla Interchange (East) Highway Authority Welsh Government Location type Non-standard interchange
M4 J40 Taibach Interchange Route M4 Name Taibach Interchange Highway Authority Welsh Government Location type Roundabout Interchange
M4 J39 Groes Interchange Route M4 Name Groes Interchange Highway Authority Welsh Government Location type Sliproad
M4 J38 Margam Interchange Route M4 Name Margam Interchange Highway Authority Welsh Government Location type Roundabout Interchange
M4 J37 Pyle Interchange Route M4 Name Pyle Interchange Highway Authority Welsh Government Location type Roundabout Interchange
M4 J36 Sarn Interchange Route M4 Name Sarn Interchange Highway Authority Welsh Government Location type Dumbbell
M4 J35 Pen-coed Interchange Route M4 Name Pen-coed Interchange Highway Authority Welsh Government Location type Roundabout Interchange
M4 J34 Miskin Interchange Route M4 Name Miskin Interchange Highway Authority Welsh Government Location type Roundabout Interchange
M4 J33 Cardiff West Route M4 Name Cardiff West Highway Authority Welsh Government Location type Roundabout Interchange
M4 J32 Coryton Interchange Route M4 Name Coryton Interchange Highway Authority Welsh Government Location type Three Level Stacked Roundabout
M4 J30 Cardiff Gate Route M4 Name Cardiff Gate Highway Authority Welsh Government Location type Roundabout Interchange
M4 J29 Castleton Interchange Route M4 Name Castleton Interchange Highway Authority Welsh Government Location type Fork
M4 J28 Tredegar Park Interchange Route M4 Name Tredegar Park Interchange Highway Authority Welsh Government Location type Non-standard interchange
M4 J26 Malpas Interchange Route M4 Name Malpas Interchange Highway Authority Welsh Government Location type Roundabout Interchange