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The M4 goes from Gunnersbury (in the west of London) to Pont Abraham (a few miles north of Swansea).

Junctions and service areasEdit

  • Junction 1: London, A4, A406, A205.
  • Junction 2: Brentford, A4.
  • Heston service area.
  • Junction 3: Hounslow, A312.
  • Junction 4: West Drayton, Heathrow Airport.
    • Junction 4A: Heathrow Airport, A4.
  • Junction 4B: M25.
  • Junction 5: Langley, A4.
  • Junction 6: Slough, Eton, Windsor.
  • Junction 7: Burnham, Slough (west).
  • Junction 8/9: Maidenhead, A308(M), A404(M).
  • Junction 10: Bracknell, Reading (east), A329(M).
  • Junction 11: Reading, A33.
  • Reading service area.
  • Junction 12: Theale, Reading (west).
  • Junction 13: Newbury, Chieveley service area, A34.
  • Junction 14: Hungerford.
  • Membury service area.
  • Junction 15: Swindon, Marlborough, A346.
  • Junction 16: Swindon, Wootton Basset.
  • Junction 17: Chippenham, A350, [A429]].
  • Leigh Delamere service area.
  • Junction 18: Bath, Chipping Sodbury, A46.
  • Junction 19: Bristol, M32.
  • Junction 20: M5.
  • Junction 21: M48.
  • Junction 22: M49.
  • Crosses River Severn on Second Severn Crossing into Wales
  • Junction 23: M48.
  • Junction 23A: Caldicot, Magor service area.
  • Junction 24: Newport (east), A449.
  • Junction 25: Newport.
  • Junction 25A: Cwmbran, A4042.
  • Junction 26: Newport, Cwmbran, A4042.
  • Junction 27: Rogerstone.
  • Junction 28: Newport (west).
  • Junction 29: Cardiff (north-east), [[A48(M)].
  • Junction 30: Cardiff (north-east).
  • Junction 32: Cardiff, Caerphilly, [A470].
  • Junction 33: Cardiff (west), Barry, Cardiff West service area), A4232.
  • Junction 34: Llantrisant.
  • Junction 35: Pencoad.
  • Junction 36: Bridgend, Sarn Park service area.
  • Junction 37: Pyle, Porthcawl.
  • Junction 38: Margam Park.
  • Junction 39: Margam.
  • Junction 40: Taibach, Cwmafan.
  • Junction 41: Port Talbot, A48.
  • Junction 42: Briton Ferry, A48.
  • Junction 43: Neath, A465.
  • Junction 44: Birchgrove.
  • Junction 45: Swansea.
  • Junction 46: Swansea (north).
  • Junction 47: Gorseinon, Swansea West service area.
  • Junction 48: Llanelli, A4138.
  • Junction 49: Ammanford, Carmarthen, Pont Abraham service area, A48, A483.

Notable StructuresEdit

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