M25

From Roader's Digest: The SABRE Wiki

M25
View gallery (204)
London Orbital
From:	Fleet Downs, near Dartford (TQ557728)
To:	Thurrock (TQ585795)
Via:	Leatherhead, Heathrow, Watford
Length:	117 miles (188.3 km)
Meets:	A2, M20, M26, M23, A3, M3, M4, M40, M1, A1, A1(M), M11, A12, A13
Former Number(s):	M16, A405, A1178
Now part of:	M26
Primary Destinations
Enfield • Reigate • Sevenoaks • Staines • Watford •
Highways Authorities
Highways Agency
Traditional Counties
Buckinghamshire • Essex • Hertfordshire • Kent • Middlesex • Surrey
Route outline (key)
M25 Fleet Downs-Chevening M25 Chevening-Wrotham 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 (N), A224 A21 (N), A224 5 A21 (S) M26, A21 (S) Clacket Lane services 6 A22, B2235 A22, B2235 7 M23 M23 8 A217 A217 9 A243, A244, A245 A243, A244, A245 Cobham services 10 A3 A3 11 A317, A320 A317, A320 12 M3 M3 13 A30, A308, B376 A30, A308, B376 14 A3113, Heathrow A3113, Heathrow 15 M4 M4 Iver services 16 M40 M40 17 (A412) (A412) 18 A404 A404 19 (A41) No Exit 20 A41, A4251 A41, A4251 21 M1 (N) M1 (N) 21a A405 A405 22 A1081 (N) B556 A1081 (N) B556 23 A1(M), A1 A1081 (S) A1(M), A1 A1081 (S) South Mimms services (at J23) 24 A111, A1005 A111, A1005 25 A10 A10 26 A121 A121 27 M11 M11 28 A12. A1023 A12, A1023 29 A127 A127 30 A13, A282 A1306, A1090 Start of Road Thurrock services (at J30)

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.

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.

Contents 1 Junctions 1.1 List of M25 Named Junctions 1.2 Bignell's Corner 1.3 Chevening Interchange 1.4 Chiswell Interchange 1.5 Merstham Interchange 2 Services 2.1 South Mimms services 2.2 Clacket Lane services 2.3 Thurrock services 3 Opening Dates 4 Links 4.1 CBRD 4.2 Pathetic Motorways 4.3 Motorway Services Online 4.4 SABRE Forums 4.5 BBC 4.6 Highways Agency

Junctions

List of M25 Named Junctions

Many of the junctions on the M25 have names.

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

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

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.

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.

Services

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.

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.

Thurrock services

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

Opening Dates

Links

CBRD

• Motorway Database: M25
• Futures: M25 J12-15 Widening
• Futures: M25 Holmesdale Tunnel Refurbishment
• Futures: M25 & A2 Widening
• Futures: M25 J16-23 Widening
• Futures: M25 J27-30 Widening

Pathetic Motorways

• Ringways for Beginners: Ringway 3
• Ringways for Beginners: Ringway 4

Motorway Services Online

• Services List: Clacket Lane
• Services List: Cobham
• Services List: South Mimms
• Services List: Thurrock

SABRE Forums

• M25 - Construction

BBC

• M25: The Road to Nowhere
• M25 Video Tours

Highways Agency

• M25 widening project

M25

Junctions • Addlestone Interchange • Bignells Corner • Brook Street Interchange • Chandlers Cross • Chevening Interchange • Chiswell Interchange • Chorleywood Interchange • Colnbrook Interchange • Cranham Interchange • Darenth Interchange • Denham Interchange • Godstone Interchange • Hewitts Roundabout • Hunton Bridge • M25 J20 • M25 J21A • Maple Cross Interchange • Mar Dyke Interchange • Merstham Interchange • Potters Bar Interchange • Poyle Interchange • Reigate Hill Interchange • Runnymede Interchange • Swanley Interchange • Terminal 5 Roundabout • The Bell Roundabout • Theydon Bois Interchange • Thorpe Interchange • Waltham Abbey Interchange • Waltham Cross Interchange • Wisley Interchange

Services • Clacket Lane services • Cobham services • Iver services • South Mimms services • Thurrock services

Crossings • Bell Common Tunnel • Brook St. Interchange • Holmesdale Tunnel • M25 Bridge (Wisley) • M25 Lea Bridge • Runnymede Viaducts

Roads • E15 • E30

Miscellaneous • Dartford • Heathrow Airport • M25 Named Junctions • Rickmansworth • Swanley

Related Pictures View gallery (204)

Other nearby roads London A1 • A1(M) • A10 • A101 • A11 • A121 • A127 • A13 • A2 • A2(M) (Kidbrooke - Falconwood) • A20 • A233 • A30 • A40 • A41 • A5 • B269 • B519 • E1 (Old System) • E105 (Old System) • E107 (Old System) • E108 (Old System) • E13 • E2 (Old System) • E30 • E33 (Old System) • E5 (Old System) • E8 (Old System) • Ermine Street • Great North Road • Holyhead Road • London Inner Ring Road • M1 • M11 • M12 (Brentwood - Chelmsford) • M12 (Woodford - Brentwood) • M12 (Woodford - Maplin) • M13 • M15 • M16 • M20 • M23 • M3 • M40 • M41 • Northern and Western Motorway • Project GNR • Watling Street • Dartford Crossing A2000 • A226 • A282 • E15 • M13 • M16 • Reigate A2044 • A217 • A242 • A25 • B2034 • Heathrow Airport A30 • A3044 • A3113 • A4 • A408 • A437 • B377 • E30 • M4 • Watford A4008 • A405 • A41 • A41(M) • A411 • A412 • A4125 • A4140 • A4145 • A4178 • A4251 • A500 (Marble Arch - Finchley) • A5088 (Watford Bypass) • B4542 • B462 • E13 • E30 • M1 • Watford Bypass •

Motorways in Great Britain Current Motorways: M1 · 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) · 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 Former Motorways/Old Numbers: M10 · M15 · M16 · M41 · M52 · M62 · M63 ·M64 · M65 · M68 · M85 · M270 · M531 · M600 A2(M) · A4(M) · A5(M) · A8(M) · A18(M) · A20(M) · A36(M) · A40(M) · A41(M) · A46(M) · A48(M) · A48(M) A102(M) · A423(M) · A446(M) · A604(M) ·A638(M) · A6127(M) · A6138(M) · A6144(M) Unbuilt Plans: M4 Toll · M12 · M13 · M17 · M19 · M31 · M59 · M60 · M64 · M272 · M601 · M650 · A2(M) · A6(M) ·A61(M) · A556(M) · A695(M) · Other Motorways M91 · M96 · M101 · 'M399