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M4

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M4
Location Map ( geo)
Cameraicon.png View gallery (540)
From:  Chiswick, Middlesex (TQ19578)
To:  Pont Abraham, Carmarthenshire (SN575071)
Via:  Slough, Reading, Swindon, Bath, Bristol, Newport, Cardiff, Port Talbot, Swansea
Distance:  191.9 miles (308.8 km)
Meets:  M5, M25, M32, M48, M49, A33, A34, A4, A46, A48(M), A48, A308(M), A312, A329(M), A346, A350, A404(M), A419, A429, A449, A465, A470, A483, A4042, A4138, A4232
Former Number(s):  A4, A4(M), A48(M) (Port Talbot and Morriston bypasses)
Old route now:  M48, A404(M), A48(M) (Cardiff spur)
Primary Destinations
Bridgend • Swindon • Swansea • Neath • Maidenhead • Cardiff • Newport • Reading • Slough • Port Talbot • Chippenham • Newbury • London • Bristol • Heathrow Airport
Highway Authorities

National Highways • Welsh Government


HE Area 2 • HE Area 3 • HE Area 5 • South Wales TRA
Traditional Counties

Berkshire • Buckinghamshire • Carmarthenshire • Glamorgan • Gloucestershire • Middlesex • Monmouthshire • Wiltshire

Route outline (key)
M4 Chiswick — Pont Abraham
M4 Newport Southern Bypass
M4 Maidenhead bypass
M4 Severn Bridge and approaches
Junction List
Former junctions are shown on a thick grey background.
Junc Westbound Eastbound
1 Start of Motorway A4 (E)
Bridge Chiswick Flyover
2 A4 A4
Services symbol.gif Heston services
3 A312 A312
4 (Airport Spur) (Airport Spur)
4b M25 M25
5 A4, B470 A4, B470
Services symbol.gif Datchet services
6 A335 A335
7 A4 A4
Bridge New Thames Bridge
8 A308 A308
8/9 A308(M), A404(M) A308(M), A404(M)
Services symbol.gif Maidenhead services
9a C8750, C8711 C8750, C8711
9b Temporary start of road A4
Services symbol.gif Warren Copse services
10 A329(M) A329(M)
Bridge Carters Hill Bridge
11 A33 A33
Services symbol.gif Reading services
Bridge Calcot Viaduct
12 A4 A4
Services symbol.gif Ashes Copse services
13 A34 A34
14 A338 A338
Services symbol.gif Membury services
15 A346, A419 A346, A419
16 A3102, B4005 A3102, B4005
Services symbol.gif Ballard's Ash services
17 A350, A429, B4122 A350, A429, B4122
Services symbol.gif Leigh Delamere services
18 A46 A46
Services symbol.gif Pucklechurch services
19 M32 M32
20 M5 M5
21 M48 No Exit
21 A403 A403
Services symbol.gif Aust services
22 M49 M49
22 A466 A466
Bridge Prince of Wales Bridge
23 No Exit M48
23a A4810 A4810
Services symbol.gif Wilcrick services
24 A48, A449, B4237 A48, A449, B4237
25 A4042, B4596 No Exit
25a A4042 No Exit
Tunnel Brynglas Tunnels
26 A4051 A4051
27 B4591 B4591
28 A48, A467 A48, A467
29 A48(M) No Exit
30 A4232 A4232
31 A469 A469
32 A470, A4054 A470, A4054
33 A4232 A4232
34 A4119 A4119
35 A473 A473
36 A4061, A4063 A4061, A4063
37 A4229 A4229
38 A48 A48
Services symbol.gif Port Talbot services
39 No Exit No Exit
40 A4107 A4107
41 A48, A4241, B4286 A48, A4241, B4286
42 A483 A483, A48
43 A465, B4290 A465, B4290
44 A48, A4230, B4291, B4625 A48, A4230, B4290, B4625
45 A4067, B4603 A4067, B4603
46 A48, B4489 A48, B4489
47 A48, A483 A48, A483
48 A4138 A4138
49 A48, A483 Start of Motorway
This article is about the motorway in England and Wales.
For the similarly numbered motorway in Ireland, see M4 (Republic of Ireland)
.


The M4 is the London to South Wales Motorway. Running for about 190 miles from Chiswick in the west of the capital to a point some 12 miles southeast of Carmarthen in west Wales, it passes such important centres of population and industry as Reading, Swindon, Bristol, Newport, Cardiff, and Swansea. The route forms the bulk of the E30's Fishguard to Felixstowe route in the UK.

Globe.png
For detailed information about this topic, see Roads.org.uk Motorway Database: M4

Route

London – Reading

The road into London is one of few examples of truly urban major motorways which were built as intended. It was also a pioneer of modern features, boasting three CCTV cameras, detectors to report congestion and a never-used underfloor heating system which claimed there would never be a frost on the road. The elevated section claims to have been built without "any disruption" to the Great West Road beneath it. West of the elevated section, the road widens out to dual three lanes (D3M) to junction 3 and then as four-lane Smart Motorway between junctions 3 and 12, west of Reading. The smart motorway section, opened in 2022 has lane drops and lane gains at many of the intermediate junctions.

The tensioned wire central reservation barrier fitted to the road at Langley was the first in the UK, and was used by TRL to test its effectiveness before the road opened.

Reading – Bath

Heading west towards Swindon

After Reading, the M4 becomes more rural and picturesque - travelling first through the North Wessex Downs, and then the southern Cotswolds. The motorway runs a few miles north of the A4 and the towns along it that, save for Swindon, are the main places that it serves. At junction 13 the motorway meets the major A34 north-south route, serving Newbury. At junction 14, Hungerford is served via the A338. Swindon has two junctions: junction 15, which also serves Marlborough via an extended A346, as well as the A417/A419 trunk dual carriageway to the M5 at Gloucester and junction 16, which serves western suburbs. Junction 17 serves Chippenham, with the A429 south of the junction having been renumbered A350 upon the opening of the motorway. Junction 18 with the A46 serves Bath.

Bath – Cardiff

Approaching the Second Severn Crossing from Newport

After the junction for Bath, the road continues over some rolling hills before we reach the peripheral areas of Bristol, and Junction 19 for the M32. The road continues onwards for a couple of miles as a Smart Motorway, before coming to Almondsbury Interchange, the Four Level Stack interchange with the M5. The original route of the M4 for the Severn Bridge goes along what is now the M48, with main line traffic taking the newer Second Severn Crossing at Awkley Interchange. The M49 has a junction just before the Second Severn Crossing, which one can now cross without having to pay a toll. The old toll office has now been turned into a nondescript "works unit." We meet again with the M48 at Rogiet Interchange, before being shunted with Magor Interchange two thirds of a mile later, with access to the A4810. Junction 24 is for the Coldra Interchange, with access to the A48, A449 and B4237. Another smart motorway section starts shortly before this section, in an attempt to avail the hopelessly under-capacity Newport Bypass. We meet two limited-access interchanges at junctions 25 and 25A, before entering the D2 pinch point of the Brynglas Tunnels. Almost immediately after the tunnels, we encounter Junction 26, Malpas Interchange, with access to the A4051. We then have a couple of miles without junctions, before we get to junction 27, with access to the B4591. The bends around this junction are sharper than are typical for a motorway, hence warnings on their approach. After Tredegar Park Interchange for the A48, we meet the A48(M) at Castleton Interchange, providing one-way access to the only motorway that is solely in Wales. The motorway bypasses Cardiff to the north, meeting Pentwyn Interchange for the A4232 and Coryton Interchange, one of the biggest roundabouts in the UK, providing access to the A470 and the A4054.

Cardiff – Pont Abraham

Elevated over Port Talbot

The motorway continues west from Coryton, passing J33 Capel Llanilltern Interchange before running along the southern fringe of the South Wales Valleys past Llantrisant to Pencoed. Then the motorway runs to the north of Bridgend before crossing the Ogwr Viaduct to the west of Sarn Interchange. Continuing west, the motorway soon turns northwards at Pyle, passing over a long exposed embankment and Kenfig bypass before reaching the former A48(M) (Port Talbot Bypass). At junction 38 the motorway reduces to two lanes in each direction, and remains in this configuration along its remaining length to Pont Abraham, with a couple of localised exceptions.

The Port Talbot bypass was opened in 1965 as the A48(M) and was the first section of motorway in Wales. It follows a sinuous route between the eastern fringe of the town , some times built into the steep hills east of the town. This section was renumbered M4 in 1977 when the extension to Pyle was built, as part of the plan to extend the M4 from Newport to Pont Abraham. The elevated section skirts around chapels, rugby grounds and houses. In the 1980s, the original parapets were raised and strengthened to meet current standards. For many years, the M4 had a gap between the Baglan roundabout and Lon-Las Interchange, and became famous for having the only traffic signals on the main line of a motorway at Baglan. In the early 90s the missing link was built in three contracts (two phases) comprising an extension east from Lonlas to Earlswood Interchange on the west side of the original Briton Ferry Bridge, with the second phase completing the link through construction of the M4 Briton Ferry Bridge and link to Baglan. The Briton Ferry bridge was designed in an era of tall shipping passing up the River Neath, but by the time the road opened, the shipping had long since stopped.

The section between Earlswood and Lon-Las made use of the existing A48 interchange with the A465, and the short link between the A465 and Earlswood has three lanes running in each direction.

Continuing west, the section from Lonlas to the Llangyfelach Interchange opened in 1972 and includes a climbing lane running west from Ynysforgan Interchange towards Llangyfelach. Some maps from the early 1970s show this road as the A48(M), but contemporary records shown that it opened as part of the M4. From Llangyfelach, the motorway continues west via turnings for Swansea West and Llanelli before arriving at its western terminus at roundabout Pont Abraham Interchange where the two onward routes are the A48 towards Carmarthen and the A483 which is one of the three principal north-south routes across Wales.

History

Perhaps surprisingly, the M4 may be counted Great Britain's second oldest motorway, as the Chiswick Flyover (then numbered A4, but now the first section of the M4) opened in 1959, a couple of months before the M1, M10, and M45. Other parts of this motorway started life as the A4(M) and A48(M), whilst the Severn and Wye Bridges – originally on the M4 but bypassed since 1996 by the Second Severn Crossing – now lie on the M48.

Opening dates

Globe.png
For detailed information about this topic, see Roads Database: M4 Timeline

Future

Main Article: M4/Newport Southern Bypass

Improvements

1978-1980 (Approx) – M4 Jct 24-25 and 26-28 widening

The Newport Bypass section of the M4 was widened from D2M to D3 with intermitent hardshoulders. The Brynglas Tunnels and the adjoining Usk Bridge between junctions 25 and 26 was not widened.

2005 – M4 Jct 18 widening

The eastbound carriageway was widened from D3M to D4M on the approach to Junction 18 at Tormarton. The fourth lane was added to act as a crawler lane for slow vehicles travelling up the steep hill.

2010 – M4 Jct 29 to 32 widening

The motorway was widened from D2M to D3M between Junction 29 at Castleton to Junction 32 at Coryton. The scheme started in 2007 and was completed in 2010, costing around £99.2 million in total.

2011 – M4 Jct 24 to 28 variable speed limit scheme

The motorway between Junction 24 at Coldra and Junction 28 at Tredegar Park received variable speed limits in order to help relieve congestion in and around Newport. This section of the motorway saw the installation of new gantries and speed cameras, along with the replacement of the street lighting in the central reservation.

2014 – M4 Jct 19 to 20 smart motorway scheme

The motorway was upgraded to become a smart motorway between Junction 19 at Hambrook and Junction 20 at Almondsbury. The scheme started in 2012 and was completed in 2014. Features of this smart motorway include a dynamic hard shoulder and variable speed limits.

2022 – M4 Jct 3 to 12 smart motorway scheme

The motorway was upgraded to become a smart motorway between Junction 3 at Cranford Parkway near Hayes and Junction 12 at Theale. The scheme started in September 2018 and was completed in December 2022.

Junctions

Brentford Interchange

M4J2 5 - Coppermine - 1295.jpg
Main Article: Brentford Interchange

The Brentford Interchange (junction 2) is a compact 'ironing-board' interchange.

Thorney Interchange

Colnbrook Interchange.png
Main Article: Thorney Interchange

Thorney Interchange (junction 4b of the M4; junction 15 of the M25) is a large four-level stack interchange between the M4 and M25 motorways. It is unusual in that, in addition to the various different roads that make up the junction, there is also a railway line running through it.

Chieveley Interchange

M4J13.png
Main Article: Chieveley Interchange

The Chieveley Interchange (junction 13) was upgraded in the late 2000s to a 3-level roundabout.

Almondsbury Interchange

Almondsbury Interchange.png
Main Article: Almondsbury Interchange

The Almondsbury Interchange (junction 20 of the M4; junction 15 of the M5) is an important junction allowing direct interchange between the M4 and M5, and is additionally linked to junction 16 of the M5, which provides access to and from the A38. This junction was the first example of a four-level stack in the country. The link roads leading from the M4 to the M5 pass over the top level of the interchange whilst those from the M5 to the M4 pass underneath all other levels.

Coryton Interchange

M4 Motorway Intersection near Tongwynlais - Geograph - 609448.jpg
Main Article: Coryton Interchange

The Coryton Interchange (junction 32) is a very large 3-level roundabout, with the A470. The circulatory carriageway of the roundabout is one of the longest in the country, clocking in at over a mile. The A470 mainline goes over the roundabout's north side, but under its south side.

Pont Abraham Interchange

M4; The Very End - West - Coppermine - 23287.jpg
Main Article: Pont Abraham Interchange

Pont Abraham is the westernmost motorway junction in Britain. Consisting of a roundabout with the A48 and A483, junction 49 is only one of two (junction 48 being the other one) motorway junctions signed with Welsh destinations first.

All junctions


Structures

Second Severn Crossing

Second Severn Crossing.jpg
Main Article: Second Severn Crossing

The Second Severn Crossing was constructed between 1992 and 1996 to provide relief for the Severn Bridge and Wye Bridge between England and Wales. Upon completion, the M4 moved across from the original bridges (which became part of the M48) to the new bridge.

Brynglas Tunnels

Bryn Glas Tunnels M4 (Western Portal) - Geograph - 109133.jpg
Main Article: Brynglas Tunnels

The Brynglas Tunnels are situated on the Newport bypass, between junctions 25a and 26. They are twin-bored tunnels, each carrying two traffic lanes and opened in 1967. Until recently, the eastbound tunnel was lit by orange lighting, the westbound by white. Both tunnels have overhead lane control signals for contraflow purposes.

Services

Heston services

Hello Moto - Geograph - 899212.jpg
Main Article: Heston services

Heston services are one of only two MSAs within the M25. They are located on a cramped site within Greater London, between junctions 2 and 3.

Chieveley services

Chieveley Services - Geograph - 1652843.jpg
Main Article: Chieveley services

These are situated where the M4 crosses the A34 near the village of Chieveley in Berkshire.

Leigh Delamere services

Leigh Delamere services, M4 eastbound - Geograph - 1015856.jpg
Main Article: Leigh Delamere services

Leigh Delamere services are located in Wiltshire between junctions 17 and 18. Originally, only the eastbound side was developed; the westbound side followed around ten years later.

Pont Abraham services

Pont Abraham Services - Geograph - 573375.jpg
Main Article: Pont Abraham services

Pont Abraham services are a single-site MSA located on the western terminal roundabout of the M4, at junction 49. It is operated by RoadChef.

Traffic data

From http://www.dft.gov.uk/traffic-counts/

Link 2002 AADF 2006 AADF 2010 AADF 2014 AADF
J1-2 85937 90124 78182 93447
J2-3 95837 97379 85188 99632
J3-4 132852 133351 123890 129381
J4-4A 65318 71461 60418 59922
J4-A408 50783 43052 53909 52258
J4-4B 146092 143536 148143 159549
J4B-5 140319 144512 141194 146271
J5-6 135771 145431 128060 137696
J6-7 136395 125128 128356 124932
J7-A4 27369 28278 31309 32229
J7-8/9 139769 126506 133892 136613
J8/9-10 130353 129232 123557 126109
J10-11 123834 125859 117017 117587
J11-12 108780 122224 109193 105723
J12-13 90232 92102 86349 88807
J13-14 80802 83366 92727 83402
J14-15 80802 83366 92727 83402
J15-16 80474 86672 77290 77798
J16-17 67038 69764 69852 66812
J17-18 73967 78155 79457 70193
J18-19 79278 87907 85451 89253
J19-20 102913 107711 114949 119111
J20-21 53876 62682 60512 60787
J21-22 36805 43144 41665 42024
J22-23 55607 59472 62036 61144
J23-23A 67419 75935 71476 78770
J23A-24 72296 78821 83098 86222
J24-25 97161 104720 89804 101206
J25-25a 92393 96184 89062 110033
J25A-26 74213 77193 60186 80457
J26-27 101317 107891 107168 109620
J27-28 103039 111210 107226 113134
J28-29 98404 105764 97581 114617
J29-30 59821 64779 58683 70812
J30-32 75478 65230 61809 79623
J32-33 83553 94444 93820 99756
J33-34 78262 101443 99868 94257
J34-35 72719 77065 75313 82094
J35-36 60538 67396 65720 69251
J36-37 57605 64939 62182 69388
J37-38 52209 60872 62508 67295
J38-39 50994 63279 68452 69558*
J39-40 57856 67340 63881 72596*
J40-41 59008 64789 79473 56508
J41-42 60959 69214 75384 68382
J42-43 65682 71715 58313 79674
J43-44 69098 72067 80322 81629
J44-45 56084 65969 63298 68391
J45-46 57244 68748 69351 68359
J46-47 54720 64793 62318 64528
J47-48 43273 56293 48970 51721
J48-49 35264 38455 38945 44275

Miscellanea

  • The section of the M4 between junctions 19 and 23 has the the highest number of consecutive motorway-to-motorway junctions in the United Kingdom.
  • In 1999 a controversial bus lane was established on a 5.6-km stretch of the eastbound carriageway of the M4 between junction 3 and the start of the elevated section of the motorway near Brentford. Suspended in December 2010, it was re-instated temporarily for the duration of the 2012 London Olympics.
Globe.png
For detailed information about this topic, see CBRD Motorway Database: M4 Bus Lane


Videos

M4 motorway in 1972

A drive through of the M4 Morriston Bypass shortly after opening in 1972.

Watch video > >

Bill's Bridges - M4 Port Talbot

Construction of the A48(M) Port Talbot Bypass in 1965, showing part-opened section

Watch video > >

Links

legislation.gov.uk

National Highways

Welsh Government

Roads.org.uk

BBC News

Construction and early photographs



M4
Projects
Junctions
Almondsbury Interchange • Aust Interchange • Awkley Interchange • Bray Interchange • Brentford Interchange • Caerleon Interchange • Cardiff West Interchange • Castleton Interchange • Cherry Lane Roundabout • Chieveley Interchange • Chiswick Roundabout • Coedkernew Junction • Coldra Interchange • Concord Roundabout • Coryton Interchange • Cox Green Interchange • Cranford Parkway Interchange • Dock Way Junction • Earlswood Interchange • Glan Llyn Junction • Groes Interchange • Grove Park Interchange • Hambrook Interchange • Heathrow Interchange • Hendy Interchange • High Cross Interchange • Holyport Interchange • Huntercombe Spur • M4 J31 • Langley Roundabout • Llandarcy Interchange • Llangyfelach Interchange • Lon-Las Interchange • Magor Interchange • Malpas Interchange • Margam Interchange • Miskin Interchange • Newhouse • Pencoed Interchange • Penllergaer Interchange • Pentwyn Interchange • Pentyla Interchange • Pilning Interchange • Plough Hill Roundabout • Pont Abraham Interchange • Pyle Interchange • Rogiet Interchange • Sarn Interchange • Spittleborough Roundabout • Stanton St Quintin Roundabout • Taibach Interchange • The Thicket Roundabout • Theale Interchange • Thorney Interchange • Three Mile Cross Interchange • Tormarton Interchange • Tredegar Park Interchange • Tuns Lane Interchange • Wickham Interchange • Winnersh Interchange • Ynysforgan Interchange
Services
Crossings
Roads
Places
Brentford • Bridgend • Bristol • Cardiff • Chippenham • London • Maidenhead • Neath • Newbury • Newport • Port Talbot • Reading • Slough • Swansea • Swindon
Related Pictures
View gallery (540)
M4 - Coppermine - 16699.jpg19. M4 J2 (the ironing board) - Coppermine - 1849.JPGMSA - Coppermine - 9816.jpgThe only slip road at M4 motorway junction 39, Margam, Port Talbot - Geograph - 2954313.jpgAbandoned Motorway - Geograph - 3256960.jpg
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Motorways in Great Britain
Current MotorwaysM1 • M2 • M3 • M4 • M5 • M6 • M6 Toll • M8 • M9 • M11 • M18 • M20 • M23 • M25 • M26 • M27 • M32 • M40 • M42 • M45 • M48 • M49 • M50 • M53 • M54 • M55 • M56 • M57 • M58 • M60 • M61 • M62 • M65 • M66 • M67 • M69 • M73 • M74 • M77 • M80 • M90 • M180 • M181 • M271 • M275 • M602 • M606 • M621 • M876 • M898
A1(M) • A3(M) • A8(M) • A14(M) • A38(M) • A48(M) • A57(M) • A58(M) • A64(M) • A66(M) • A74(M) • A92(M) • A167(M) • A168(M) • A194(M) • A195(M) • A308(M) • A329(M) • A404(M) • A601(M) • A627(M) • A635(M) • A666(M) • A823(M) • A1058(M) • A1077(M)
Motorway Spurs • (M4 Heathrow Spur • M25 T5 Spur • Walton Summit M'way)
Former MotorwaysM10 • M15 • M16 • M30 • M41 • M52 • M62 • M63 • M64 • M65 • M68 • M85 • M110 • M111 • M270 • M274 • M531 • M600
A2(M) • A4(M) • A5(M) • A8(M) • A11(M) • A18(M) • A20(M) • A21(M) • A23(M) • A36(M) • A40(M) (Central London) • A40(M) (Buckinghamshire) • A41(M) • A46(M) • A48(M) (Morriston) • A48(M) (Port Talbot) • A65(M) • A102(M) (North) • A102(M) (South) • A423(M) • A446(M) • A604(M) • A638(M) • A696(M) • A1231(M) • A6127(M) • A6138(M) • A6144(M)
Unbuilt MotorwaysM4 Toll • M12 (Woodford - Brentford) • M12 (Woodford - Maplin) • M12 (Brentwood - -Chelmsford) • M13 • M17 • M19 • M31 • M58 • M59 • M60 • M62 RR • M64 • M81 • M82 • M83 • M100 • M272 • M601 • M650
A2(M) • A6(M) (West) • A6(M) (East) • A14(M) • A48(M) • A59(M) • A61(M) • A556(M) • A695(M)
A Ring • Bilston Link • Belmont Link • B-W M'way • CME Bypass • CMW • Central Spine • Chippenham Spur • Coventry N-S M'way • Cublington Airport M'way • Denham Spur • Derby Urban M'way • Droitwich-Leicester M'way • East Coast M'way • EXR • East Kilbride M'way • E-W Underground M'way • Eastern M'way • Euroroute • Friars Goose Xing • Furness Link • Glasgow IRR • GM Western Relief Road • Hamilton-Cumbernauld M'way • Hook Road • Johnstone M'way • Kendal Link • Liverpool Inner M'way • LOX M'way • Malvern Radial • Manchester IRR • Morecambe Link • NE Urban M'way • NXR • N&W M'way • Paisley-Hamilton M'way • POLO • Princess P'way M'way • Reading Urban M'way • Ringway 2 • Sheffield Spur • S Bristol Spur • SCRPDR • SXR • Stirling Corner Link • Strensham-Solihill M'way • Strensham-Solihill M'way • TGAAR • Townhill Link • Trafford Park M'way • Warndon Radial • Watford Urban M'Way • Western Orbital • Weston Spur

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