Przebieg trasy
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ANGLIA, Wielki Londyn
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A4
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Central London
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autostrada M4
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(1)
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Central London, Hammersmith A4
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estakada Chiswick Flyover
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(2)
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Chiswick, Staines, Hounslow, North Circular Road, South Circular Road A4 A205 A315 A406
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MOP Heston
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(3)
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Feltham, Hayes, Hounslow, Heathrow T4 & Cargo A312
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(4)
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Hayes, Uxbridge, Heathrow T1, T2 & T3 A4 A408
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(4b)
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Heathrow T4 & Cargo, Watford, Birmingham, Gatwick, Winchester M25
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Berkshire
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(5)
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Langley, Staines, Eton A4 B470
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(6)
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Slough, Windsor A335
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Buckinghamshire
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(7)
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Slough A4
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most nad Tamizą
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Berkshire
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(8/9)
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High Wycombe, Henley-on-Thames, Maidenhead A308(M) A404(M)
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(10)
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Reading, Wokingham, Bracknell A329(M)
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(11)
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Reading, Basingstoke A33 B3270
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MOP Reading
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(12)
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Theale, Reading A4
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(13)
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Newbury, Oxford A34
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MOP Chieveley (dostęp z węzła)
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RAF Welford (kier. Londyn)
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(14)
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Hungerford, Wantage A338
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MOP Membury
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Wiltshire
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(15)
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Malborough, Swindon, Oxford A346 A419
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(16)
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Swindon, Wootton Bassett, RAF Lyneham, Calne A3102 B4005
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(17)
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Cirencester, Chippenham A350 A429 B4122
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MOP Leigh Delamere
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Gloucestershire
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(18)
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Bath, Stroud A46
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(19)
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Bristol M32
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(20)
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The MIDLANDS, The SOUTH WEST, Gloucester, Bristol M5
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(21)
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Chepstow (kier. Swansea) M48
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(22)
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The SOUTH WEST, Avonmouth M49
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most Second Severn Crossing nad rzeką Severn (5128 m)
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WALIA, Monmouthshire
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(23)
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Chepstow (kier. Londyn) M48
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(23a)
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Magor B4245
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MOP Magor (dostęp z węzła)
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(24)
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The MIDLANDS, Monmouth, Newport A48 A449 B4237
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(25)
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Caerleon B4596
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(25a)
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Newport, Cwmbran A4042
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tunel Brynglas Tunnel (362 m)
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(26)
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Cwmbran, Newport, Caerleon A4051
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(27)
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High Cross B4591
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(28)
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Cwmbran, Newport, Caerleon A48 A467
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(29)
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Cardiff (kier. Swansea) A48(M)
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Glamorgan
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(30)
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Cardiff A4232
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MOP Cardiff Gate (dostęp z węzła)
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(32)
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Cardiff, Merthyr Tydfil A470
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(33)
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Cardiff, Cardiff Airport, Barry, Penarth A4232
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MOP Cardiff West (dostęp z węzła)
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(34)
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Llantrisant, Rhondda A4232
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(35)
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Bridgend, Pen-coed A473
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(36)
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Bridgend, Maesteg A4061 A4063
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MOP Sarn Park (dostęp z węzła)
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(37)
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Pyle, Porthcawl A4229
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(38)
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Port Talbot (brak wjazdu w kier. Swansea) A48
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(39)
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Port Talbot (jedynie wjazd w kier. Swansea) A48
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(40)
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Port Talbot A4107
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(41)
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Port Talbot (półwęzeł) A48 B4286
[1]
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(41)
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Briton Ferry(półwęzeł) A48
[2]
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most nad rzeką Neath
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(42)
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Swansea (półwęzeł) A483
[1]
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(42)
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Briton Ferry, Swansea (półwęzeł) A48 A483
[1]
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(43)
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Neath, Merthyr Tydfil A465 B4290
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(44)
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Swansea A48 A4230 B4291
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(45)
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Swansea, Pontardawe A4067 B4603
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(46)
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Llangyfelach, Felindre A48 B4489
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(47)
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Swansea A48 A483
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MOP Swansea (dostęp z węzła)
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most nad rzeką Loughor
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Carmarthenshire
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(48)
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Pontarddulais, Llanelli A4138
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(49)
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rondo Llandeilo A48 A483
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MOP Pont Abraham (dostęp z ronda)
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koniec autostrady
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A48
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Carmarthen
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