M4 motorway The
M4 motorway is a
motorway in the
UK , which goes west from
London past
Bristol to
Wales
Westbound
The M4 starts six miles west of central London where the A4 merges into the M4 on a raised flyover. (The A4 continues in its own right below the flyover.)
Junction 1 (restricted access): A205 South Circular, A406 North Circular , A315 Chiswick, A4.
Junction 2: A4 Staines, Hounslow.
Heston services.
Junction 3: A312 Heathrow Airport Terminal 4 and cargo, Hayes, Harrow, Feltham.
Junction 4: M4 spur Heathrow Airport terminals 1, 2 & 3, A408 Uxbridge. Access via spur to Junction 4a and A4 east and west.
Junction 4b: M25 Heathrow Airport Terminal 4 and cargo, Gatwick Airport, Watford, Oxford.
Junction 5: A4 Colnbrook, Langley, B470 Dachet.
Junction 6: A355 Slough central, A332 Windsor.
Junction 7: A4 Slough west.
Junction 8/9: A404M High Wycombe, Henley, A308M Maidenhead.
Junction 10: A329M Reading east, Wokingham, Bracknell.
Junction 11: A33 Basingstoke, Reading central and south.
Reading services.
Junction 12: A4 Theale, Reading west.
Junction 13: A34 Newbury, Oxford, Chieveley services.
Junction 14: A338 Hungerford, Wantage.
Membury services.
Junction 15: A346 Marlborough, A419 Swindon, Gloucester.
Junction 16: A3102 Swindon west, Wootton Bassett, Calne.
Junction 17: A350 Chippenham, A429 Cirencester.
Leigh Delamere services.
Junction 18: A46 Bath, Stroud.
Junction 19: M32 Bristol.
Junction 20: M5 The south west, Bristol west, The midlands, Gloucester.
Junction 21: M48 Chepstow This is the old M4
Junction 22: M49 Avonmouth.
Second Severn Crossing (bridge).
Junction 23: No exit
Junction 23a: Magor services. B4245 Magor, Caldicot.
Junction 24: A455/A48 Newport east, A449 Monmouth.
Junction 25: B4596 Caerleon.
Junction 25a: A4042 Newport, Cwmbran.
Junction 26: A4051 Newport.
Junction 27: B4591 High Cross.
Junction 28: A48 Newport, A467 Risca, Brynmawr.
Junction 29: A48(M) Cardiff east and south.
Junction 30: A4232 Cardiff east.
There is no Junction 31
Junction 32: A470 Cardiff north, Merthyr Tydfil.
Junction 33: Cardiff West services. A4232 Cardiff west, Barry, Penarth, airport.
Junction 34: A4119 Llantrisant, Rhondda.
Junction 35: A473 Bridgend, Pen-coed.
Junction 36: Sarn Park services. A4061 Bridgend, A4063 Maesteg.
Junction 37: A4229 Porthcawl, Pyle.
Junction 38: A48 Port Talbot.
There is no Junction 39
Junction 40: A4107 Port Talbot.
Junction 41: A48 Briton Ferry.
Junction 42: A483 Swansea and ferry.
Junction 43: A465 Neath, Merthyr Tydfil.
Junction 44: A48 Swansea east.
Junction 45: A4067 Swansea, Pontardawe.
Junction 46: B4489 Swansea north.
Junction 47: Swansea West services. A483 Swansea west.
Junction 48: A4138 Pontarddulais, Llanelli.
Junction 49: End of motorway. Pont Abraham services. A48 Carmarthen, Pontarddulais, A483 Llandeilo.
Eastbound
Start of the motorway. Pont Abraham services. A48 Carmarthen, Pontarddulais, A483 Llandeilo.
Junction 48: A4138 Pontarddulais, Llanelli.
Junction 47: Swansea West services. A483 Swansea west.
Junction 46: B4489 Swansea north.
Junction 45: A4067 Swansea, Pontardawe.
Junction 44: A48 Swansea east.
Junction 43: A465 Neath, Merthyr Tydfil.
Junction 42: A483 Swansea and ferry, A48 Briton Ferry.
Junction 41: A48 Port Talbot.
Junction 40: A4107 Port Talbot.
There is no Junction 39
Junction 38: A48 Port Talbot.
Junction 37: A4229 Porthcawl, Pyle.
Junction 36: Sarn Park services. A4061 Bridgend, A4063 Maesteg.
Junction 35: A473 Pen-coed.
Junction 34: A4119 Llantrisant, Rhondda.
Junction 33: Cardiff West services. A4232 Cardiff west, Barry, Penarth, airport.
Junction 32: A470 Cardiff, Merthyr Tydfil.
There is no Junction 31
Junction 30: A4232 Cardiff east.
Junction 29: No exit .
Junction 28: A48 Newport, A467 Risca, Brynmawr.
Junction 27: B4591 High Cross.
Junction 26: A4051 Newport, Cwmbran, Caerleon.
Junction 25a: No exit
Junction 25: No exit
Junction 24: M50 The Midlands, A48/A455 Newport, A449 Monmouth.
Junction 23a: Magor services. B4245 Magor, Caldicot.
Junction 23: M48 Chepstow This is the old M4
Second Severn Crossing (bridge).
Junction 22: M49 Avonmouth, The south west.
Junction 21: No exit
Junction 20: M5 The south west, Bristol west, The midlands, Gloucester.
Junction 19: M32 Bristol.
Junction 18: A46 Bath, Stroud.
Leigh Delamere services.
Junction 17: A350 Chippenham, A429 Cirencester.
Junction 16: A3102 Swindon west, Wootton Bassett, Calne.
Junction 15: A346 Marlborough, A419 Swindon east. A420 Oxford.
Membury services.
Junction 14: A338 Hungerford, Wantage.
Unnumbered junction reserved for military use
Junction 13: A34 Newbury, Oxford, Chieveley services.
Junction 12: A4 Theale, Reading west.
Reading services.
Junction 11: A33 Basingstoke, Reading central and south.
Junction 10: A329M Reading east, Wokingham, Bracknell.
Junction 8/9: A404M High Wycombe, Henley, A308M Maidenhead.
Junction 7: A4 Slough west.
Junction 6: A355 Slough central, A332 Windsor.
Junction 5: A4 Colnbrook, Langley, B470 Eton, Dachet.
Junction 4b: M25 Heathrow Airport Terminal 4 and cargo, Gatwick Airport, Watford, Oxford.
Junction 4: M4 spur to Heathrow Airport terminals 1, 2 & 3, A408 Uxbridge, Hayes. Access via spur to Junction 4a and A4 east and west.
Junction 3: A312 to Heathrow Airport Terminal 4 and cargo, Hayes, Harrow, Hounslow.
Heston services.
Junction 2 (restricted access): A205 South Circular, A406 North Circular, A315 Chiswick, A4.
Junction 1: No exit
The M4 ends six miles west of central London where it becomes the A4.
See also List of motorways in the United Kingdom
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