M4 motorway

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M4 shield

M4
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))
 Junction 4b.svg UK-Motorway-M25.svg
J4b → M25 motorway
Junction 8-9.svg UK-Motorway-A308 (M).svg/UK-Motorway-A404 (M).svg
J8/9 → A308(M) motorway/A404(M) motorway
Junction 10.svg UK-Motorway-A329 (M).svg
J10 → A329(M) motorway
Junction 19.svg UK-Motorway-M32.svg
J19 → M32 motorway
Junction 20.svg UK-Motorway-M5.svg
J20 → M5 motorway
Junction 21.svg UK-Motorway-M48.svg
J21 → M48 motorway
Junction 22.svg UK-Motorway-M49.svg
J22 → M49 motorway
Junction 23.svg UK-Motorway-M48.svg
J23 → M48 motorway
Junction 29.svg UK-Motorway-A48 (M).svg
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
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

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.

Junctions[change | change source]

M4 motorway
mile km Eastbound exits (B carriageway) Junction Westbound exits (A carriageway)
7.3 11.8 Road continues as A4 to Central London J1
[coord 1]
Start of motorway
8.3
8.5
13.4
13.7
North Circular A406
South Circular A205
Chiswick A315
J2 Staines, Hounslow, Brentford A4
12.5
12.8
20.1
20.6
Heston services Services Heston services
13.4
13.7
21.5
22.1
Heathrow 20 airtransportation.svg (Terminals 4, 5 & Cargo), Hayes, Harrow, Hounslow A312 J3 Heathrow 20 airtransportation.svg (Terminals 4, 5 & Cargo), Hayes, Harrow, Hounslow A312
15.2
15.7
24.5
25.2
Heathrow 20 airtransportation.svg (Terminals 2 & 3) (A4)
Uxbridge A408
J4a Heathrow 20 airtransportation.svg (Terminals 2 & 3) (A4)
Uxbridge A408
16.8
17.7
27.0
28.5
Heathrow (Terminals 4, 5 & Cargo) 20 airtransportation.svg, Gatwick Airport 20 airtransportation.svg, Watford (M3), (M23), (M40), (M1) M25 J4b
[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
J5 Colnbrook, Langley, Slough (East) A4, Datchet B470
22.9
23.2
36.8
37.4
Slough (Central) A355
Windsor A322
J6 Slough (Central) A355
Windsor A322
24.7
25.0
39.8
40.3
Slough (West) A4 J7 Slough (West) A4
27.8
28.2
44.7
45.4
High Wycombe, Henley A404(M)
Maidenhead A308(M)
J8/9 High Wycombe, Henley A404(M)
Maidenhead A308(M)
35.0
35.8
56.4
57.6
Reading (East), Wokingham, Bracknell A329(M) J10 Reading (East), Wokingham, Bracknell A329(M)
40.6
41.2
65.4
66.3
Basingstoke, Reading (Central & South) A33 J11 Basingstoke, Reading (Central & South) A33
43.5
43.8
70.0
70.5
Reading services Services Reading services
45.3
45.7
72.9
73.5
Reading (West), Theale A4 J12 Reading (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 A338 J14 Hungerford, Wantage A338
68.7 110.5 Membury services Services Membury services
76.4
77.1
122.9
124.0
Swindon (East) A419
Marlborough A346
Oxford (A420)
J15 Swindon A419, Marlborough A346
82.4
82.8
132.6
133.2
Swindon (West), Royal Wootton Bassett, Wroughton, MoD Lyneham, Calne A3102 J16 Swindon (West), Royal Wootton Bassett, Wroughton, MoD Lyneham, Calne A3102
94.8
95.3
152.5
153.4
Chippenham A350
Cirencester A429
J17 Chippenham A350
Cirencester A429
96.7 155.7 Leigh Delamere services Services Leigh Delamere services
104.9
105.6
168.8
170.0
Bath, Stroud A46 J18 Bath, Stroud A46
112.8
113.2
181.5
182.1
Bristol M32 J19 Bristol M32
115.8
116.3
186.3
187.2
The SOUTH WEST, Bristol (West), The MIDLANDS, Gloucester, Bristol Airport 20 airtransportation.svg, M5 J20
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 access J21 Chepstow M48
121.3
121.6
195.2
195.7
Avonmouth M49 J22 Avonmouth M49
121.7
124.1
195.9
199.8
Entry into England Second Severn Crossing
[coord 5]
Entry into Wales
127.0 204.4 No toll plaza Bridge Toll Former Toll plaza (closed Dec 2018)
129.2 208.0 Chepstow M48 J23 No 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)
J24 City centre A48
Newport (East) B4237
Monmouth A449
137.9 222.0 No access J25 Caerleon B4596
138.3 222.6 No access J25A Newport, Cwmbran A4042
138.8
139.1
223.4
223.8
Brynglas Tunnels Tunnel Brynglas Tunnels
139.1
139.5
223.8
224.5
Newport, Cwmbran, Caerleon A4051 J26 Newport A4051
140.8
141,4
226.6
227.6
High Cross B4591 J27 High Cross B4591
142.0
142.9
228.5
230.0
Newport A48
Risca, Brynmawr A467
J28 Newport A48
Risca, Brynmawr A467
143.6 231.1 No access J29 Cardiff (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 A470 J32 Cardiff (North), Merthyr Tydfil A470
155.4
156.0
250.1
251.1
Cardiff (West), Barry, Penarth A4232
Cardiff Airport 20 airtransportation.svg
Cardiff West services
J33
Services
Cardiff (West), Barry, Penarth A4232
Cardiff Airport 20 airtransportation.svg
Cardiff West services
157.5
158.1
253.5
254.4
Llantrisant, Rhondda A4119
Royal Glamorgan Hospital
J34 Llantrisant, Rhondda A4119
Royal Glamorgan Hospital
163.9
164.4
263.7
264.5
Pen-coed A473 J35 Bridgend, 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 A4229 J37 Porthcawl, Pyle A4229
177.0
177.3
284.9
285.3
Port Talbot A48 J38 Port Talbot A48
178.3 286.9 No access (on-ramp only) J39 No access
179.7
179.9
289.2
289.6
Port Talbot A4107 J40 Port Talbot A4107
180.9
181.3
291.1
291.8
Port Talbot A48 J41 Briton Ferry A48
183.9
184.9
295.9
297.3
Briton Ferry A48
Swansea (South) A483
J42 Swansea (South) A483
184.9
185.7
297.5
298.8
Neath, Merthyr Tydfil A465 J43 Neath, Merthyr Tydfil A465
187.0
187.4
300.9
301.6
Swansea (East) A48 J44 Swansea (East) A48
188.8
189.3
303.9
304.7
Pontardawe, Swansea (North) A4067 J45 Pontardawe, Swansea (North) A4067
190.8
191.4
307.0
308.0
Llangyfelach B4489
Felindre
Morriston Hospital
J46 Llangyfelach 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 A4138 J48 Pontarddulais, Llanelli A4138
199.2 320.6 Start of motorway J49
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 | change source]

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

Coordinates[change | change source]

KML is from Wikidata