| ENGLAND, Greater London
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Weiter auf  Central London
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Beginn der Autobahn
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(1)
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Central London, Hammersmith
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(2)
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Chiswick, Staines-upon-Thames, Hounslow, North Circular Road
South Circular Road   
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Heston
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(3)
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Feltham, Hayes, Hounslow, Heathrow T4 & Cargo 
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(4)
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Hayes, Uxbridge, Heathrow T1, 2 & 3 
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(4B)
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Heathrow T4 & Cargo, Watford, Birmingham
Gatwick, Winchester ( )
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| Berkshire
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(5)
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Langley, Staines, Eton B470
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(6)
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Slough, Windsor 
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| Buckinghamshire
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(7)
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Slough
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Themse
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| Berkshire
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(8/9)
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High Wycombe, Henley-on-Thames, Maidenhead
 
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(10)
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Reading, Wokingham, Bracknell 
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(11)
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Reading, Basingstoke  B3270
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Reading
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(12)
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Theale, Reading
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(13)
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Newbury, Oxford 
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Chieveley (neben der vorherigen Anschlussstelle)
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(14)
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Hungerford, Wantage 
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Membury
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| Wiltshire
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(15)
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Marlborough, Swindon, Oxford  
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(16)
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Swindon, Royal Wootton Bassett, RAF Lyneham,
Calne  B4005
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(17)
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Cirencester, Chippenham   B4122
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Leigh Delamere
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| Gloucestershire
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(18)
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Bath, Stroud 
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(19)
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Bristol 
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(20)
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The MIDLANDS, The SOUTH WEST,
Gloucester, Bristol 
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(21)
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Chepstow  (ABG London)
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(22)
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The SOUTH WEST, Avonmouth 
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Zweite Severnbrücke (Severn) 5.128 m
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| WALES, Monmouthshire
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Mautstelle (nur Richtung Swansea)
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(23)
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Chepstow (ABG Swansea)
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(23A)
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Magor B4245
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Magor (neben der Anschlussstelle)
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(24)
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The MIDLANDS, Monmouth,
Newport   B4237
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(25)
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Caerleon B4596
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(25A)
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Newport, Cwmbran 
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Brynglas Tunnel 362 m
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(26)
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Cwmbran, Newport, Caerleon 
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(27)
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High Cross B4591
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(28)
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Cwmbran, Newport, Caerleon 
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(29)
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Cardiff  (ABG London)
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| Glamorgan
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(30)
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Cardiff 
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Cardiff Gate (neben der Anschlussstelle)
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(32)
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Cardiff, Merthyr Tydfil 
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(33)
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Cardiff, Cardiff Airport, Barry, Penarth
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Cardiff West (neben der Anschlussstelle)
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(34)
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Llantrisant, Rhondda
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(35)
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Bridgend, Pencoed 
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(36)
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Bridgend, Maesteg  
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Sarn Park (neben der Anschlussstelle)
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(37)
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Pyle, Porthcawl 
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(38)
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Port Talbot (Keine Ausfahrt Ri. London)
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(39)
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Port Talbot (Ausfahrt Ri. London)
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(40)
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Port Talbot 
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(41)
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Port Talbot B4286 (TAS Swansea)
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(41)
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Briton Ferry (HAS London)
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Neath
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(42)
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Swansea  (HAS London)
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(42)
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Briton Ferry, Swansea (HAS Swansea)
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(43)
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Neath, Merthyr Tydfil  B4290
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(44)
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Swansea  B4291
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(45)
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Swansea, Pontardawe  B4603
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(46)
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Llangyfelach, Felindre B4489
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(47)
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Swansea
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Swansea (neben der Anschlussstelle)
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Loughor
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| Carmarthenshire
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(48)
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Pontarddulais, Llanelli 
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(49)
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Llandeilo
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Pont Abraham (neben dem Kreisverkehr)
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Ende der Autobahn
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Weiter auf Carmarthen
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