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M4 motorway

motorway in the United Kingdom

The M4 is a long motorway in the United Kingdom. It goes from London to South Wales. It also passes Bristol. It was first called the London–South Wales Motorway.

M4 shield
M4
New Severn Bridge - panoramio.jpg
Prince of Wales Bridge looking towards Wales
Route information
Part of
Maintained by
Highways England
South Wales Trunk Road Agent
Length189 mi[1] (304 km)
Existed1963–present
HistoryOpened: 1959 (Chiswick Flyover), 1961 (as A4(M)), 1963, 1966 (as A48(M))
Completed: 1996
Major junctions
East endChiswick
51°29′23″N 0°16′41″W / 51.4897°N 0.2781°W / 51.4897; -0.2781 (M4 motorway (eastern end))
Major intersections
J4b → M25 motorway
/
J8/9 → A308(M) motorway/A404(M) motorway

J10 → A329(M) motorway

J19 → M32 motorway

J20 → M5 motorway

J21 → M48 motorway

J22 → M49 motorway

J23 → M48 motorway

J29 → A48(M) motorway
ToPont Abraham
51°44′42″N 4°03′54″W / 51.7451°N 4.0651°W / 51.7451; -4.0651 (M4 motorway (western end))
Location
CountryUnited Kingdom
CountiesGreater London, Berkshire, Wiltshire, Gloucestershire, Monmouthshire, Newport, Cardiff, Vale of Glamorgan, Rhondda Cynon Taf, Bridgend, Neath Port Talbot, Swansea, Carmarthenshire
Primary
destinations
London
London Heathrow Airport
Slough
Maidenhead
Reading
Newbury
Swindon
Bristol
Newport
Cardiff
Bridgend
Port Talbot
Neath
Swansea
Road network
← M3M5 →

Junctions change

M4 motorway
milekmEastbound exits (B carriageway)JunctionWestbound exits (A carriageway)
7.311.8Road continues as A4 to Central LondonJ1
[coord 1]		Start of motorway
8.3
8.5		13.4
13.7		North Circular A406
South Circular A205
Chiswick A315		J2Staines, Hounslow, Brentford A4
12.5
12.8		20.1
20.6		Heston servicesServicesHeston services
13.4
13.7		21.5
22.1		Heathrow (Terminals 4, 5 & Cargo), Hayes, Harrow, Hounslow A312J3Heathrow (Terminals 4, 5 & Cargo), Hayes, Harrow, Hounslow A312
15.2
15.7		24.5
25.2		Heathrow (Terminals 2 & 3) (A4)
Uxbridge A408		J4aHeathrow (Terminals 2 & 3) (A4)
Uxbridge A408
16.8
17.7		27.0
28.5		Heathrow (Terminals 4, 5 & Cargo) , Gatwick Airport , Watford (M3), (M23), (M40), (M1) M25J4b
[coord 2]		Heathrow (Terminals 4, 5&Cargo), Gatwick, Watford (M3), (M23), (M40), (M1), M25
19.1
19.5		30.7
31.4		Colnbrook, Langley, Slough (East) A4
Eton, Datchet B470		J5Colnbrook, Langley, Slough (East) A4, Datchet B470
22.9
23.2		36.8
37.4		Slough (Central) A355
Windsor A322		J6Slough (Central) A355
Windsor A322
24.7
25.0		39.8
40.3		Slough (West) A4J7Slough (West) A4
27.8
28.2		44.7
45.4		High Wycombe, Henley A404(M)
Maidenhead A308(M)		J8/9High Wycombe, Henley A404(M)
Maidenhead A308(M)
35.0
35.8		56.4
57.6		Reading (East), Wokingham, Bracknell A329(M)J10Reading (East), Wokingham, Bracknell A329(M)
40.6
41.2		65.4
66.3		Basingstoke, Reading (Central & South) A33J11Basingstoke, Reading (Central & South) A33
43.5
43.8		70.0
70.5		Reading servicesServicesReading services
45.3
45.7		72.9
73.5		Reading (West), Theale A4J12Reading (West), Theale A4
56.9
57.2		91.5
92.1		Newbury, Oxford A34
Chieveley services (Moto)		J13
Services
[coord 3]		Newbury, Oxford A34
Chieveley services (Moto)
64.4
64.8		103.7
104.3		Hungerford, Wantage A338J14Hungerford, Wantage A338
68.7110.5Membury servicesServicesMembury services
76.4
77.1		122.9
124.0		Swindon (East) A419
Marlborough A346
Oxford (A420)		J15Swindon A419, Marlborough A346
82.4
82.8		132.6
133.2		Swindon (West), Royal Wootton Bassett, Wroughton, MoD Lyneham, Calne A3102J16Swindon (West), Royal Wootton Bassett, Wroughton, MoD Lyneham, Calne A3102
94.8
95.3		152.5
153.4		Chippenham A350
Cirencester A429		J17Chippenham A350
Cirencester A429
96.7155.7Leigh Delamere servicesServicesLeigh Delamere services
104.9
105.6		168.8
170.0		Bath, Stroud A46J18Bath, Stroud A46
112.8
113.2		181.5
182.1		Bristol M32J19Bristol M32
115.8
116.3		186.3
187.2		The SOUTH WEST, Bristol (West), The MIDLANDS, Gloucester, Bristol Airport , M5J20
Almondsbury Interchange
[coord 4]		The SOUTH WEST, Bristol (West) M5(S)
The MIDLANDS, Gloucester M5(N)
117.7
189.5		189.5
190.0		No accessJ21Chepstow M48
121.3
121.6		195.2
195.7		Avonmouth M49J22Avonmouth M49
121.7
124.1		195.9
199.8		Entry into EnglandSecond Severn Crossing
[coord 5]		Entry into Wales
127.0204.4No toll plazaBridge TollFormer Toll plaza (closed Dec 2018)
129.2208.0Chepstow M48J23No access
131.4
132.2		211.4
212.8		Magor, Caldicot A4810
Magor services		J23A
Services		Magor, Caldicot A4810
Magor services
134.8
135.6		217.0
218.3		City centre A48
Newport (East) B4237
Monmouth A449
The MIDLANDS (M50)		J24City centre A48
Newport (East) B4237
Monmouth A449
137.9222.0No accessJ25Caerleon B4596
138.3222.6No accessJ25ANewport, Cwmbran A4042
138.8
139.1		223.4
223.8		Brynglas TunnelsTunnelBrynglas Tunnels
139.1
139.5		223.8
224.5		Newport, Cwmbran, Caerleon A4051J26Newport A4051
140.8
141,4		226.6
227.6		High Cross B4591J27High Cross B4591
142.0
142.9		228.5
230.0		Newport A48
Risca, Brynmawr A467		J28Newport A48
Risca, Brynmawr A467
143.6231.1No accessJ29Cardiff (East and South) A48(M)
146.6
147.3		236.0
237.0		Cardiff (East) A4232
Cardiff Gate services		J30
Services		Cardiff (East) A4232
Cardiff Gate services
151.9
244.5		244.5
246.1		Merthyr Tydfil, Cardiff A470J32Cardiff (North), Merthyr Tydfil A470
155.4
156.0		250.1
251.1		Cardiff (West), Barry, Penarth A4232
Cardiff Airport
Cardiff West services		J33
Services		Cardiff (West), Barry, Penarth A4232
Cardiff Airport
Cardiff West services
157.5
158.1		253.5
254.4		Llantrisant, Rhondda A4119
Royal Glamorgan Hospital		J34Llantrisant, Rhondda A4119
Royal Glamorgan Hospital
163.9
164.4		263.7
264.5		Pen-coed A473J35Bridgend, Pen-coed A473
167.5
168.3		269.6
270.8		Bridgend A4061
Maesteg A4063
Princess of Wales Hospital
Sarn Park services		J36
Services		Bridgend A4061
Maesteg A4063
Princess of Wales Hospital
Sarn Park services
172.8
173.5		278.1
279.3		Pyle, Porthcawl A4229J37Porthcawl, Pyle A4229
177.0
177.3		284.9
285.3		Port Talbot A48J38Port Talbot A48
178.3286.9No access (on-ramp only)J39No access
179.7
179.9		289.2
289.6		Port Talbot A4107J40Port Talbot A4107
180.9
181.3		291.1
291.8		Port Talbot A48J41Briton Ferry A48
183.9
184.9		295.9
297.3		Briton Ferry A48
Swansea (South) A483		J42Swansea (South) A483
184.9
185.7		297.5
298.8		Neath, Merthyr Tydfil A465J43Neath, Merthyr Tydfil A465
187.0
187.4		300.9
301.6		Swansea (East) A48J44Swansea (East) A48
188.8
189.3		303.9
304.7		Pontardawe, Swansea (North) A4067J45Pontardawe, Swansea (North) A4067
190.8
191.4		307.0
308.0		Llangyfelach B4489
Felindre
Morriston Hospital		J46Llangyfelach B4489
Felindre
Morriston Hospital
192.4
193.1		309.6
310.7		Swansea (West) A483
Gorseinon A48
Swansea services		J47
Services		Swansea (West) A483
Gorseinon A48
Swansea services
196.4
197.1		316.0
317.2		Pontarddulais, Llanelli A4138J48Pontarddulais, Llanelli A4138
199.2320.6Start of motorwayJ49
Terminus
Services
[coord 6]		Motorway terminates at a roundabout:
Carmarthen A48
Ammanford, Llandeilo A483
Pontarddulais A48
Pont Abraham services
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References change

  1. ↑ "Directions to M4, Hendy, Swansea". Google. Retrieved 11 February 2017.

Coordinates change

  1. ↑ 51°29′22″N 0°16′40″W / 51.48944°N 0.27778°W / 51.48944; -0.27778 (Start of M4) Eastern end of M4
  2. ↑ 51°29′41″N 0°29′44″W / 51.49472°N 0.49556°W / 51.49472; -0.49556 (Junction 5b of M4) Intersection of M25 and M4
  3. ↑ 51°27′14″N 1°18′52″W / 51.45389°N 1.31444°W / 51.45389; -1.31444 (Junction 13 of M4) Intersection of M4 and A34 (E05)
  4. ↑ 51°33′01″N 2°33′11″W / 51.55028°N 2.55306°W / 51.55028; -2.55306 (J20 of M4) Almondsbury Interchange – Intersection of M4 and M5
  5. ↑ 51°34′21″N 2°41′31″W / 51.57250°N 2.69194°W / 51.57250; -2.69194 (M4 Severn Crossing) Second Severn Crossing
  6. ↑ 51°44′42″N 4°03′54″W / 51.74500°N 4.06500°W / 51.74500; -4.06500 (End of M4) Western end of M4
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