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M25

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M25
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London Orbital
From:Fleet Downs, near Dartford (TQ557728)
To:Thurrock (TQ585795)
Via:Leatherhead, Heathrow, Watford
Length:117 miles (188.3 km)
Meets: A282, A2, M20, M26, M23, A3, M3, M4, M40, A41, M1, A405, A1, A1(M), A10, M11, A12, A13, A282
Former Number(s):M16, A6, A405, A1178
Old route now:M26
Primary Destinations
Heathrow Airport • Stansted Airport
Highway Authorities

Highways England

Traditional Counties

Buckinghamshire • Essex • Hertfordshire • Kent • Middlesex • Surrey

Route outline (key)
M25 Fleet Downs-Chevening
M25 Wrotham-Chevening
M25 Chevening-Thurrock
Junction List
Junc Clockwise Anti-Clockwise
2 Start of Road A2, A225; A282
3 M20, A20, B2173 M20, A20, B2173
4 A21, A224 A21, A224
5 A21 M26, A21
- A233 A233
Services symbol.gif Clacket Lane services
6 A22, B2235 A22, B2235
7 M23 M23
8 A217 A217
Services symbol.gif Lower Kingswood services
9 A243, A244, A245 A243, A244, A245
Services symbol.gif Cobham services
10 A3 A3
11 A317, A320 A317, A320
12 M3 M3
13 A30, A308, B376 A30, A308, B376
14 A3113, Terminal 5 A3113, Terminal 5
15 M4 M4
Services symbol.gif Iver services
- A412, A4007 A412, A4007
16 M40 M40
Services symbol.gif Chalfont St Peter services
17 A412 A412
18 A404 A404
- Cublington Airport Cublington Airport
19 (A41) No Exit
20 A41, A4251 A41, A4251
21 M1 (N) M1 (N)
21A A405, (M1 (S)) A405, (M1 (S))
22 A1081, B556 A1081, B556
23 A1(M), A1, A1081 A1(M), A1, A1081
Services symbol.gif South Mimms services (at J23)
24 A111, A1005 A111, A1005
25 A10 A10
26 A121 A121
- A11 A11
27 M11 M11
Services symbol.gif Hill Hall services
- North Orbital North Orbital
- M12 M12
28 A12, A1023 A12, A1023
29 A127 A127
30 A13; A282, (A1090, A1306) Start of Road
Services symbol.gif Thurrock services (at J30)
Globe.png
For detailed information about this topic, see CBRD Motorway Database

The M25 is one of the nation's busiest motorways, carrying up to 200,000 vehicles and 10,000 HGVs per day (AADT) near to Heathrow Airport. Since its opening in the 1980s, the southern, western and eastern sections have been widened to largely D4M standard, but much of the motorway retains its D3M cross-section as originally built. The M25 was home to England's first Variable Speed Limits on motorways between the A3 and M4 in the early 1990s.

Contents

Route

Main Article: M25/Route

The M25 forms most of a circle between Dartford in Kent and Thurrock in Essex, surrounding Greater London. On the way it passes Sevenoaks, Reigate, Redhill, Heathrow Airport, Watford, Potters Bar and Brentwood. Most of the motorway is now four lanes wide, and large sections of it are subject to Active Traffic Management.

The M25 does not make a complete circuit around London; the route through the Dartford Crossing, though often de-facto considered part of the M25, is the A282, an all-purpose road.

History

Main Article: M25/History

The M25 as constructed is part of two separately planned motorways, M25 Ringway 4, and M16 Ringway 3. The linking sections between the two projects are located between junctions 3 and 5; and between junctions 19 and 23. Due to this change in plan, parts of M25 opened with the numbers A405 and A1178. The M25 is slightly shorter than Germany's A10 Berliner Ring.

Opening Dates

For detailed information about this section, see CBRD Motorway Database: M25 Timeline

Traffic Data

Main Article: M25/Traffic Data

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

Section 2002 AADF 2006 AADF 2010 AADF 2014 AADF
A282-A2 105864 101151 111619 80596
J2-3 141623 129795 124073 121228
J3-4 114055 112206 112280 112754
J4-5 103362 99802 95185 87029
J4-A21 38996 40895 37498 38929
J5-A21 53018 51840 52175 47895
J5-6 128962 127825 123852 130335
J6-7 135773 133038 136224 137211
J7-8 150915 160118 153982 165611
J8-9 153636 153818 147389 141712
J9-10 133791 144111 145225 152040
J10-11 154123 170398 163620 175975
J12-13 167634 150060 175351 174230
J13-14 193528 168722 195360 186940
J14-15 178329 156545 185633 262842
J15-16 179064 150601 177555 174934
J16-17 135569 125861 123593 147650
J17-18 138993 135840 112295 164111
J18-19 135757 156513 126743 177350
J19-20 123477 122364 114344 150811
J19-A41 26523 28179 22959 23722
J20-21 132623 132946 111860 150989
J21-21A 102429 99681 64948 95122
J21A-22 121049 113763 114646 136255
J22-23 120709 126507 122853 133532
J23-24 130910 119217 130517 145131
J24-25 113475 115857 136926 121626
J25-26 111494 118585 110037 123164
J26-27 108421 89481 97683 114815
J27-28 120765 105755 113472 125847
J28-29 106109 125766 104605 113084
J29-30 139263 116420 108033 116230
J29-30 139263 116420 108033 116230
J30-31 74866 74059 71680 70125
A1306-A282 129936 128744 115137 115926

Services

Clacket Lane services

Entrance to Clackett Lane Services (westbound) - Geograph - 1003698.jpg
Main Article: Clacket Lane services

Clacket Lane is located on the southern side of the M25, between M23 and M26. It is unusually named after the road that runs over the M25 at this point, and was at one time famous for its expensive fuel.

Cobham services

Cobham services first night.jpg
Main Article: Cobham services

Cobham services is a single-site MSA situated on the southern side of the M25 but serving both directions, located 5 miles southeast of J10 for the A3. It was opened in 2012 and is the most recent services opened on the motorway.

South Mimms services

South Mimms Service Area, Junction A1(M) and M25 - Geograph - 493514.jpg
Main Article: South Mimms services

South Mimms is a single-site MSA shared with the A1(M). It was the first MSA to open on the M25, and was rebuilt in the late 1990s.

Thurrock services

Thurrock Motorway Service Area.jpg
Main Article: Thurrock services

Thurrock services are on the Essex side of the M25, just north of the A282 Dartford Crossing.

Unbuilt services

Additional service areas have been proposed at Chevening, Lower Kingswood, Iver, Chalfont St Peter and Hill Hall.

Junctions

List of M25 Named Junctions

Main Article: M25/Named Junctions

All of the junctions on the M25 have names.


Bignell's Corner

Bignell's Corner Interchange.png
Main Article: Bignell's Corner

Bignell's Corner is a large three-level roundabout interchange providing full access between the M25, A1(M), A1081, South Mimms services and local roads. It is junction 1 of the A1(M), and junction 23 of the M25. The A1(M) passes underneath the roundabout in a north-south direction at the lowest level, with the M25 passing over the roundabout at the highest level in an east-west direction.

Chevening Interchange

Main Article: Chevening Interchange

The Chevening Interchange is a restricted access freeflow interchange between the M25, M26 and A21 northwest of Sevenoaks. It is notorious for requiring a TOTSO for M25 traffic, and having no turn offs for the M26 westbound and A21 northbound.

Chiswell Interchange

Chiswell Interchange.png
Main Article: Chiswell Interchange

The Chiswell Interchange is a major junction between the M1 and M25 motorways near St Albans in Hertfordshire. The junction is a modified directional-T style interchange, with the modification being that instead of terminating, the M1 continues through the junction. No links from or to the southern M1 are provided. These are instead provided by the nearby A405 link between M25 junction 21A and M1 junction 6.

Merstham Interchange

Merstham Interchange.PNG
Main Article: Merstham Interchange

The Merstham Interchange is the junction between the M25 and the M23. It is one of three four-level stacks in the United Kingdom. The junction is only a mile south of the terminus of the M23, the Hooley Interchange. Consequently, very little traffic heads north from here.


Links

CBRD

Roads UK

Pathetic Motorways

Motorway Services Online

SABRE Forums

BBC

Highways Agency/England

legislation.gov.uk



M25
JunctionsAddlestone Interchange • Bignells Corner • Brentwood Interchange • Bricket Wood Junction • Brook Street Interchange • Chandlers Cross • Chevening Interchange • Chipstead Interchange • Chiswell Interchange • Chorleywood Interchange • Colnbrook Interchange • Cranham Interchange • Darenth Interchange • Denham Interchange • Denham Roundabout • Godstone Interchange • Hewitts Roundabout • Hunton Bridge • Iver Heath Interchange • Kings Langley Interchange • Leatherhead Interchange • Maple Cross Interchange • Mar Dyke Interchange • Merstham Interchange • Ockendon Interchange • Potters Bar Interchange • Poyle Interchange • Reigate Hill Interchange • Runnymede Interchange • Sarratt Interchange • Swanley Interchange • Terminal 5 Roundabout • The Bell Roundabout • Theydon Bois Interchange • Thorpe Interchange • Waltham Abbey Interchange • Waltham Cross Interchange • Westerham Interchange • Wisley Interchange
ServicesChevening services • Clacket Lane services • Cobham services • Iver services • South Mimms services • Thurrock services
CrossingsBell Common Tunnel • Holmesdale Tunnel • Lower Thames Crossing/Option A • M25 Lea Bridge • Runnymede Viaducts
RoadsE15 • E30 • T5 Spur
MiscellaneousM25/History • M25/Named Junctions • M25/Route • M25/Traffic Data
Related Pictures
View gallery (340)
5 lanes each - Coppermine - 3724.jpgChiswell Interchange with M10.pngM25 J21 - Coppermine - 23752.jpgM25-M23 - Coppermine - 14047.jpgRoadworks on the M25 - Geograph - 2386859.jpg
Other nearby roads
LondonA1 • A1(M) • A10 • A101 • A11 • A11(M) • A127 • A13 • A2 • A2(M) (Kidbrooke - Falconwood) • A20 • A21 • A216 • A23 • A23(M) • A233 • A24 • A3 • A30 • A30/Sandbox • A4 • A4/Great West Road • A4/Slough - London • A40 • A40/Central London - Denham • A41 • A41/Central London - Watford • A41/Watford - Aylesbury • A5 • A5/Central London - Brockley • B269 • B519 • E1 (Old System) • E105 (London - Fishguard) • E107 (London - Tilbury) • E108 (London - Southend) • E13 • E15 • E2 (Old System) • E30 • E31 (via Carlisle) • E31 (via Newcastle) • E33 (London - Glasgow) • E5 (Old System) • E8 (Old System) • East Cross Route • Ermine Street • EuroVelo 2 • EuroVelo 5 • Great North Road • Holyhead Road • London Inner Ring Road • Longest Lane • M1 • M100 • M11 • M12 (Brentwood - Chelmsford) • M12 (Woodford - Brentwood) • M12 (Woodford - Maplin) • M13 • M14 • M15 • M16 • M20 • M23 • M3 • M30 • M4 • M40 • M41 • NCN1 • NCN13 • NCN20 • NCN21 • NCN4 • Northern and Western Motorway • Orbital Tunnel Route • RM3 • Ringway 2 • South Cross Route • T1 (Britain) • T10 (Britain) • T11 (Britain) • T12 (Britain) • T2 (Britain) • T3 (Britain) • T31 (Britain) • T32 (Britain) • T33 (Britain) • T34 (Britain) • T35 (Britain) • T4 (Britain) • T5 (Britain) • T6 (Britain) • T8 (Britain) • T9 (Britain) • Watling Street
Dartford CrossingA1090 (Purfleet) • A13 • A1306 • A2 • A206 • A225 • A282 • A296 • B2228 • E15 • M13 • M16
ReigateA2002 • A2044 • A217 • A242 • A25 • B2034 • B2035 • Pilgrims Way
Heathrow AirportA30 • A30/Hounslow - Bagshot • A30/Sandbox • A3044 • A3113 • A4 • A4/Slough - London • A408 • A437 • B378 • B379 • E105 (London - Fishguard) • E30 • Longest Lane • M4 • M4/Airport Spur • Northern Perimeter Road • Southern Perimeter Road • T5 Spur • T9 (Britain) • Western Perimeter Road
WatfordA4008 • A405 • A41 • A41(M) • A41/Central London - Watford • A41/Watford - Aylesbury • A411 • A412 • A4125 • A4140 • A4145 • A4163 • A4178 • A4251 • A500 (Marble Arch - Finchley) • A5088 (Watford Bypass) • B4504 (Rickmansworth - Watford) • B4539 • B4542 • B460 • B462 • B468 • C102 (Hertfordshire) • C104 (Hertfordshire) • C122 (Hertfordshire) • C123 (Hertfordshire) • C124 (Hertfordshire) • C177 (Hertfordshire) • C74 (Hertfordshire) • C75 (Hertfordshire) • C77 (Hertfordshire) • E13 • E30 • E31 (via Carlisle) • E33 (London - Glasgow) • Hatfield - Reading Turnpike • M1 • T102 (Britain) • T35 (Britain)
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)
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) • 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