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The M4 Motorway

The M4 Motorway crosses 10 counties. These are Berkshire, Buckinghamshire, Dyfed, Gloucestershire, Greater London, Gwent, Mid Glamorgan, South Glamorgan, West Glamorgan and Wiltshire.

Map of the M4 Motorway

Dots represent junctions.

Motorway Services on the M4

Services Name Motorway

Cardiff Gate Services

Cardiff Gate Services operated by Welcome Break Pontprennau, Cardiff, CF23 8RP
Cardiff

Cardiff West Services

Cardiff West Services operated by Moto M4 Junction 33, Pontyclun, CF72 8SA
Cardiff

Chieveley Services

Chieveley Services operated by Moto M4, 13 A34, Oxford Road, Hermitage, Thatcham, RG18 9XX
Berkshire

Heston Services

Heston Services operated by Moto 55 N Hyde Ln, Hounslow TW5 0EP
Greater London

Leigh Delamere Services

Leigh Delamere Services operated by Moto Leigh Delamere Motorway Services Area, M4, Leigh Delamere, Chippenham SN14 6LB
Wiltshire

Magor Services

Magor Services operated by Roadchef M4, Caldicot NP26 3YL
Monmouthshire

Membury Services

Membury Services operated by Welcome Break Lambourn, Lambourn Woodlands, Hungerford RG17 7TZ
Berkshire

Pont Abraham Services

Pont Abraham Services operated by RoadChef M4 Junction, Pontarddulais SA4 0FU
Carmarthenshire

Reading Services

Reading Services operated by Moto M4 between Junction 11 and 12, Burghfield, Reading RG30 3UQ
Berkshire

Sarn Park Services

Sarn Park Services operated by Welcome Break Sarn Park, Sarn, Bridgend CF32 9SY
Glamorgan

Swansea Services

Swansea Services operated by Moto M4 Junction 47, Penllergaer, Swansea SA4 9GT
West Glamorgan
Junction Numbers
J1, Brentford
J2, Brentford
J3, London
J4B, West drayton
J4, London
J4A, London
J5, Slough
J6, Slough
J7, Slough
J8, Maidenhead
J10, Wokingham
J11, Great lea common
J12, Theale
J13, Chieveley
J14, Shefford woodlands
J15, Badbury
J16, Swindon
J17, Lower stanton st quintin
J18, Tormarton
J19, Hambrook
J20, Bradley stoke
J21, Tockington
J22, New passage
J23A, Magor / magwyr
J23, Gwndy / undy
J24, Newport / casnewydd
J25A, Newport / casnewydd
J25, Newport / casnewydd
J26, Newport / casnewydd
J27, Newport / casnewydd
J28, Newport / casnewydd
J29, Pen-y-lan
J30, Cardiff / caerdydd
J32, Tongwynlais
J33, Capel llanilltern
J34, Groes-faen
J35, Pencoed
J36, Pen-y-cae
J37, North cornelly
J38, Cwrt-y-defaid
J39, Port talbot
J40, Port talbot
J41, Port talbot
J42, Briton ferry / llansawel
J43, Neath / castell-nedd
J44, Abertawe / swansea
J45, Abertawe / swansea
J46, Abertawe / swansea
J47, Penllergaer
J48, Hendy
J49, Sardis
Intersecting Motorways
M5
M25
M32
M48
A48(M)
M49
A308(M)
A329(M)
A404(M)