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overgang in/uit A4 van/naar Central Londen
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Autosnelweg
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 1
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Central London, Hammersmith A4
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| 2
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Chiswick, Staines, Hounslow, North Circular Road
South Circular Road A4 A20 A315 A406
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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, 2 & 3 A4 A408
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| 4B
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Heathrow T4 & Cargo, Watford, Birmingham
Gatwick, Winchester (M25)
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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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| 7
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Slough A4
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Themse
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| 8/9
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High Wycombe, Henley, Maidenhead
A30(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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|
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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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|
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Chieveley (naast de voormalige afrit)
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| 14
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Hungerford, Wantage A338
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|
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Membury
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| 15
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Marlborough, Swindon, Oxford A346 A419
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| 16
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Swindon, Royal 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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|
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Leigh Delamere
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| 18
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Bath, Stroud A46
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| 19
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Bristol M32
|
| 20
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The MIDLANDS, The SOUTH WEST,
Gloucester, Bristol M5
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| 21
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Chepstow M48
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| 22
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The SOUTH WEST, Avonmouth M49
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|
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Second Severn Crossing (Severn) 5.128 m }
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|
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tolpoort (alleen richtung Swansea)
|
| 23
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Chepstow M48
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| 23A
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Magor B4245
|
|
|
Magor (neben der Anschlussstelle)
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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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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
|
| 28
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Cwmbran, Newport, Caerleon A48 A467
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| 29
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Cardiff A48(M)
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| 30
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Cardiff A4232
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|
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Cardiff Gate (naast de afrit)
|
| 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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|
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Cardiff West (naast de afrit)
|
| 34
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Llantrisant, Rhondda A4232
|
| 35
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Bridgend, Pen-coed A473
|
| 36
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Bridgend, Maesteg A4061 A4063
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|
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Sarn Park (naast de afrit)
|
| 37
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Pyle, Porthcawl A4229
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| 38
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Port Talbot A48 (geen afrit Ri. London)
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| 39
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Port Talbot A48 (afrit Ri. London)
|
| 40
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Port Talbot A4107
|
| 41
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Port Talbot A48 B4286
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| 41
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Briton Ferry A48
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|
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Neath
|
| 42
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Swansea A483
|
| 42
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Briton Ferry, Swansea A48 A483
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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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|
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Swansea (naast de afrit)
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|
|
Loughor
|
| 48
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Pontarddulais, Llanelli A4138
|
 49
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Llandeilo A48 A483
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|
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Pont Abraham naast de rotonde)
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Autosnelwegeinde
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|
|
verder als A48 Carmarthen
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