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Traffic Wales information line
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The Welsh Government’s traffic information service for motorways and trunk roads in Wales
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M4
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Junction 24 Coldra
Junction 29 Castleton
Junction 32 Coryton
Junction 35 Pencoed
Junction 43 Llandarcy
Junction 49 Pont Abraham
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M4
J22-23 Prince of Wales Bridge Avon East
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M4
J22-23 Prince of Wales Bridge Avon West
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M4
Shoots Bridge East (Eastbound)
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M4
Shoots Bridge West (Eastbound)
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M4
J22-23 Prince of Wales Bridge Gwent East (E/B)
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M4
J22-23 Prince of Wales Bridge Gwent West (E/B)
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M4
J22-23 Prince of Wales Bridge West (Eastbound)
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M4
Toll Plaza East (Westbound)
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M4
Toll Plaza West (Westbound)
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M4
J23 Rogiet (Westbound)
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M4
Magor East (Westbound)
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M4
J23A Magor (Westbound)
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M4
Magor West (Eastbound)
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M4
Wilcrick (Westbound)
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M4
Llanmartin (Westbound)
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M4
Langstone (Westbound)
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A449
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M4
J24 Coldra (Eastbound)
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M4
Coldra East (Westbound)
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M4
Coldra West (Eastbound)
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M4
Christchurch East (Eastbound)
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M4
Christchurch West (Westbound)
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M4
St Julians (Eastbound)
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M4
St Julians East (Eastbound)
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M4
Caerleon East (Westbound)
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A4042
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M4
J25 Caerleon (Eastbound)
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A4042
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M4
J25A Grove Park / A4042 (Eastbound)
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M4
J26 Malpas (Eastbound)
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M4
Malpas Straight (Eastbound)
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M4
Allt-yr-yn (Eastbound)
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M4
High Cross East (Eastbound)
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M4
J27 High Cross (Eastbound)
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M4
Bassaleg (Westbound)
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M4
J28 Tredegar Park (Westbound)
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A48M
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M4
Cleppa Park (Westbound)
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M4
Pound Hill (Westbound)
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M4
J29 Castleton (Westbound)
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M4
J29 - J30 Eastbound
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M4
J29 - J30 Michaelston-y-Fedw (Westbound)
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M4
J29 - J30 Began (Westbound)
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M4
J30 Cardiff Gate (Westbound) 1
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M4
J30 - J32 Pontprennau (Westbound)
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M4
J30 - J32 Lisvane (Westbound)
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M4
J30 - J32 Thornhill (Westbound)
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M4
J30 - J32 Rhiwbina (Westbound)
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M4
J32 Pantmawr
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M4
J32 Eastbound Onslip
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M4
J32 West of Whitchurch
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A470
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M4
J32 Tongwynlais Spur
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A470
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M4
J32 Northbound Onslip from A470
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M4
West of J32 Coryton (Westbound)
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M4
J32 Eastbound Offslip
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M4
J33 - 32 Morganstown (Eastbound)
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M4
J32 - J33 Radyr (Eastbound)
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M4
Rhydlafar
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M4
Capel East
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M4
J33 Westbound Approach
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M4
J33 Capel Llanilltern (Westbound)
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M4
West of J33 Capel Llanilltern
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M4
West of J33 Capel Llanilltern
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M4
Groes-Faen
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M4
Miskin
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M4
J35 - J34 Miskin (Eastbound)
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M4
J34 - 35 Pontyclun (Eastbound)
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M4
J35 Pencoed (Eastbound)
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M4
Sarn East
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M4
J36 Sarn (Westbound)
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M4
Sarn West
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M4
Court Colman
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M4
Stormy Down (Westbound)
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M4
J37 Pyle (Westbound)
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M4
Kenfig (Westbound)
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M4
J38 Margam (Eastbound)
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M4
J39 Groes (Eastbound)
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M4
Groes West (Westbound)
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M4
Taibach East (Eastbound)
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M4
J40 Taibach (Westbound)
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M4
Taibach West (Westbound)
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M4
J41 Pentyla (Westbound)
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M4
Sunnycroft (Westbound)
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M4
Briton Ferry East (Eastbound)
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M4
Briton Ferry West (Westbound)
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M4
J42 Earlswood (Eastbound)
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M4
J43 Llandarcy (Eastbound)
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M4
J43 Llandarcy (Eastbound)
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M4
J44 Lon Las (Eastbound)
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M4
Lon Las East (Westbound)
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M4
J45 Ynysforgan (Eastbound)
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M4
J45 - J46 Morriston Hospital (Eastbound)
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M4
J46 Llangyfelach (Eastbound)
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M4
J47 Penllergaer (Eastbound)
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M4
J48 Hendy (Westbound)
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M4
Dyffryn Farm
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M4
J49 Pont Abraham
M4
J22-23 Prince of Wales Bridge Avon East
M4
J22-23 Prince of Wales Bridge Avon West
M4
Shoots Bridge East (Eastbound)
M4
Shoots Bridge West (Eastbound)
M4
J22-23 Prince of Wales Bridge Gwent East (E/B)
M4
J22-23 Prince of Wales Bridge Gwent West (E/B)
M4
J22-23 Prince of Wales Bridge West (Eastbound)
M4
Toll Plaza East (Westbound)
M4
Toll Plaza West (Westbound)
M4
J23 Rogiet (Westbound)
M4
Magor East (Westbound)
M4
J23A Magor (Westbound)
M4
Magor West (Eastbound)
M4
Wilcrick (Westbound)
M4
Llanmartin (Westbound)
M4
Langstone (Westbound)
M4
J24 Coldra (Eastbound)
M4
Coldra East (Westbound)
M4
Coldra West (Eastbound)
M4
Christchurch East (Eastbound)
M4
Christchurch West (Westbound)
M4
St Julians (Eastbound)
M4
St Julians East (Eastbound)
M4
Caerleon East (Westbound)
M4
J25 Caerleon (Eastbound)
M4
J25A Grove Park / A4042 (Eastbound)
M4
J26 Malpas (Eastbound)
M4
Malpas Straight (Eastbound)
M4
Allt-yr-yn (Eastbound)
M4
High Cross East (Eastbound)
M4
J27 High Cross (Eastbound)
M4
Bassaleg (Westbound)
M4
J28 Tredegar Park (Westbound)
M4
Cleppa Park (Westbound)
M4
Pound Hill (Westbound)
M4
J29 Castleton (Westbound)
M4
J29 - J30 Eastbound
M4
J29 - J30 Michaelston-y-Fedw (Westbound)
M4
J29 - J30 Began (Westbound)
M4
J30 Cardiff Gate (Westbound) 1
M4
J30 - J32 Pontprennau (Westbound)
M4
J30 - J32 Lisvane (Westbound)
M4
J30 - J32 Thornhill (Westbound)
M4
J30 - J32 Rhiwbina (Westbound)
M4
J32 Pantmawr
M4
J32 Eastbound Onslip
M4
J32 West of Whitchurch
M4
J32 Tongwynlais Spur
M4
J32 Northbound Onslip from A470
M4
West of J32 Coryton (Westbound)
M4
J32 Eastbound Offslip
M4
J33 - 32 Morganstown (Eastbound)
M4
J32 - J33 Radyr (Eastbound)
M4
Rhydlafar
M4
Capel East
M4
J33 Westbound Approach
M4
J33 Capel Llanilltern (Westbound)
M4
West of J33 Capel Llanilltern
M4
West of J33 Capel Llanilltern
M4
Groes-Faen
M4
Miskin
M4
J35 - J34 Miskin (Eastbound)
M4
J34 - 35 Pontyclun (Eastbound)
M4
J35 Pencoed (Eastbound)
M4
Sarn East
M4
J36 Sarn (Westbound)
M4
Sarn West
M4
Court Colman
M4
Stormy Down (Westbound)
M4
J37 Pyle (Westbound)
M4
Kenfig (Westbound)
M4
J38 Margam (Eastbound)
M4
J39 Groes (Eastbound)
M4
Groes West (Westbound)
M4
Taibach East (Eastbound)
M4
J40 Taibach (Westbound)
M4
Taibach West (Westbound)
M4
J41 Pentyla (Westbound)
M4
Sunnycroft (Westbound)
M4
Briton Ferry East (Eastbound)
M4
Briton Ferry West (Westbound)
M4
J42 Earlswood (Eastbound)
M4
J43 Llandarcy (Eastbound)
M4
J43 Llandarcy (Eastbound)
M4
J44 Lon Las (Eastbound)
M4
Lon Las East (Westbound)
M4
J45 Ynysforgan (Eastbound)
M4
J45 - J46 Morriston Hospital (Eastbound)
M4
J46 Llangyfelach (Eastbound)
M4
J47 Penllergaer (Eastbound)
M4
J48 Hendy (Westbound)
M4
Dyffryn Farm
M4
J49 Pont Abraham
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0300 123 1213
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@TrafficWalesS
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