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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 |