M25 motorway

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UK-Motorway-M25.svg

M25
London Orbital Motorway
M25 motorway (Great Britain) map.svg
Egham M25 aerial 2011.jpg
Junction 13 looking south
Route information
Part of Tabliczka E15.svg and Tabliczka E30.svg
Maintained by Highways England
Length117 mi (188 km)
Existed1975–present
HistoryOpened: 1975
Completed: 1986
Major junctions
Orbital around London (in conjunction with the A282)
South end Darenth
  Junction 3.svg UK-Motorway-M20.svg
J3 → M20 motorway
Junction 5.svg UK-Motorway-M26.svg
J5 → M26 motorway
Junction 7.svg UK-Motorway-M23.svg
J7 → M23 motorway
Junction 12.svg UK-Motorway-M3.svg
J12 → M3 motorway
Junction 15.svg UK-Motorway-M4.svg
J15 → M4 motorway
Junction 16.svg UK-Motorway-M40.svg
J16 → M40 motorway
Junction 21.svg UK-Motorway-M1.svg
J21 → M1 motorway
Junction 23.svg UK-Motorway-A1 (M).svg
J23 → A1(M) motorway
Junction 27.svg UK-Motorway-M11.svg
J27 → M11 motorway
North end Aveley
Location
Counties Kent, Surrey, Berkshire, Greater London, Buckinghamshire, Hertfordshire, Essex
Primary
destinations
London
Sevenoaks
Reigate
Staines-upon-Thames
Heathrow Airport
Watford
St Albans
Enfield
Road network
UK-Motorway-M23.svg M23 M26 UK-Motorway-M26.svg

The M25 or London Orbital Motorway is 117 miles (188 km) long encircling almost all of Greater London, England (with the exception of North Ockendon). An ambitious concept to build four concentric ring roads around London was first mooted in the 1960s. A few sections of the outer two rings were constructed in the early 1970s, but the plan was abandoned and the sections were later integrated to form a single ring which became the M25, aka London Ring Road, finally completed in 1986.

Greater London County of England

Greater London is a ceremonial county of England that is located within the London region. This region forms the administrative boundaries of London and is organised into 33 local government districts—the 32 London boroughs and the City of London, which is located within the region but is separate from the county. The Greater London Authority, based in Southwark, is responsible for strategic local government across the region and consists of the Mayor of London and the London Assembly. The City of London Corporation is the principal local authority for the City of London, with a similar role to that of the 32 London borough councils.

North Ockendon village in the United Kingdom

North Ockendon is the easternmost and most outlying settlement of Greater London, England and part of the London Borough of Havering. It is located 18.4 miles (29.6 km) east northeast of Charing Cross and consists of a dispersed settlement within the Metropolitan Green Belt. It was historically an ancient parish in the county of Essex, that was abolished for civil purposes in 1936. North Ockendon is the only area in London located outside of the M25 London Orbital Motorway. North Ockendon is located on the border with Essex. The area to the south is South Ockendon.

The London Ringways were a series of four ring roads planned in the 1960s to circle London at various distances from the city centre. They were part of a comprehensive scheme developed by the Greater London Council (GLC) to alleviate traffic congestion on the city's road system by providing high speed motorway-standard roads within the capital linking a series of radial roads taking traffic into and out of the city. Following a campaign by Homes before Roads, the scheme was cancelled in 1973, at which point only three sections had been constructed.

Contents

It is one of the busiest of the British motorway network: the stretch between Junctions 14 and 15 outside Heathrow Airport consistently records the highest number of daily traffic counts on the British strategic road network with the average flow in 2017 of 211,059 counts (lower than the record peak measured in 2014 of 262,842 counts). [1] This compares to 197,219 counts measured on the M1 motorway between junction 7 and 8 outside Hemel Hempstead in 2014, and 195,325 counts measured on the M60 motorway between junctions 12 and 13 in Western Manchester, also in 2014.

M1 motorway motorway in central England connecting London and Leeds

The M1 motorway connects London to Leeds, where it joins the A1(M) near Aberford, to connect to Newcastle. It was the first inter-urban motorway to be completed in the UK; the first motorway in the country was the Preston By-pass, which later became part of the M6.

Hemel Hempstead Town in Hertfordshire, England

Hemel Hempstead is a historic town, later developed as a new town, in Hertfordshire, England. Located 24 miles (39 km) northwest of London, it is part of the Greater London Urban Area. The population according to the 2001 Census was 81,143, and at the 2011 census was 94,932. Developed after the Second World War as a new town, it has existed as a settlement since the 8th century and was granted its town charter by King Henry VIII in 1539. It is part of the district of Dacorum and the Hemel Hempstead constituency.

M60 motorway motorway in Greater Manchester

The M60 motorway, Manchester Ring Motorway, or Manchester Outer Ring Road, is an orbital motorway in North West England. Built over a 40-year period, it passes through all Greater Manchester's metropolitan boroughs except for Wigan and Bolton. Most of Manchester is encompassed within the motorway, except for the southernmost part of the city which is served by the M56.

The M25, plus the short non-motorway A282 which joins the two ends of the M25 across the River Thames using the Dartford Crossing, is Europe's second longest orbital road after the Berliner Ring, which is 122 miles (196 km).

River Thames river in southern England

The River Thames, known alternatively in parts as the Isis, is a river that flows through southern England including London. At 215 miles (346 km), it is the longest river entirely in England and the second longest in the United Kingdom, after the River Severn.

Dartford Crossing

The Dartford-Thurrock River Crossing, commonly known as the Dartford Crossing and until 1991 the Dartford Tunnel, is a major road crossing of the River Thames in England, carrying the A282 road between Dartford in Kent to the south with Thurrock in Essex to the north. It consists of two bored tunnels and the cable-stayed Queen Elizabeth II Bridge. The only fixed road crossing of the Thames east of Greater London, it is the busiest estuarial crossing in the United Kingdom, with an average daily use of over 130,000 vehicles. It opened in stages: the west tunnel in 1963, the east tunnel in 1980 and the bridge in 1991. The crossing, although not officially designated a motorway, is considered part of the M25 motorway's route, using the tunnels northbound and bridge southbound. Described as one of the most important road crossings in Britain, it suffers from heavy traffic and congestion.

Bundesautobahn 10 federal motorway in Germany

Bundesautobahn 10 is an orbital motorway around the German capital city of Berlin. Colloquially called Berliner Ring, it is predominantly located in the state of Brandenburg, with a short stretch of 5 km in Berlin itself. It should not be confused with the Berliner Stadtring around Berlin's inner city.

Description

Carriageway widths of the M25 November 2009 M25 works.png
Carriageway widths of the M25 November 2009

Originally built almost wholly as a dual three-lane motorway, much of the motorway has been widened: to dual four lanes for almost half, to a dual five-lanes section between junctions 12 and 14 and a dual six-lane section between junctions 14 and 15. Further widening is in progress of minor sections with plans for managed motorways in many others. [2]

To the east of London the two ends of the M25 are joined to complete a loop by the non-motorway A282 Dartford Crossing of the River Thames between Thurrock and Dartford. This crossing, which consists of twin two-lane tunnels and the four-lane QE2 (Queen Elizabeth II) bridge, is named Canterbury Way. Passage across the bridge or through the tunnels is subject to a toll, its level depending on the kind of vehicle. This stretch being non-motorway, it allows traffic, including that not permitted to use motorways, to cross the River Thames east of the Woolwich Ferry; the only crossing further to the east is a passenger ferry between Gravesend, in Kent, and Tilbury, in Essex. However, in 2017 Highways England published plans to build another motorway-grade Thames tunnel to the east of Gravesend and Grays, the Lower Thames Crossing, in order to relieve congestion on the A282 Dartford Crossing and connect the M25 at North Ockendon in Essex with the M2 in Kent. [3]

Thurrock Borough & Unitary authority area in England

Thurrock is a unitary authority area with borough status in the English ceremonial county of Essex. It is part of the London commuter belt and an area of regeneration within the Thames Gateway redevelopment zone. The local authority is Thurrock Council.

Toll road roadway for which a fee (or toll) is assessed for passage

A toll road, also known as a turnpike or tollway, is a public or private road for which a fee is assessed for passage. It is a form of road pricing typically implemented to help recoup the cost of road construction and maintenance.

Woolwich Ferry ferry across the River Thames in east London

The Woolwich Ferry is a free vehicle and pedestrian ferry across the River Thames in East London, connecting Woolwich on the south bank with North Woolwich on the north. It is licensed and financed by London River Services, the maritime arm of Transport for London (TfL). The service is operated by Briggs Marine under licence from TfL and carries both foot passengers and vehicles. Around two million passengers use the ferry each year.

At Junction 5, the clockwise carriageway of the M25 is routed off the main north–south dual carriageway onto the main east–west dual carriageway with the main north–south carriageway becoming the A21. In the opposite direction, to the east of the point where the M25 diverges from the main east–west carriageway, that carriageway become the M26 motorway. [4]

Dual carriageway road

A dual carriageway or divided highway is a class of highway with carriageways for traffic travelling in opposite directions separated by a central reservation. Roads with two or more carriageways which are designed to higher standards with controlled access are generally classed as motorways, freeways, etc., rather than dual carriageways.

A21 road (England) trunk road in Southern England

The A21 is a trunk road in Southern England, one of several which connect London and various commuter towns to the south coast. It provides a link to Hastings, East Sussex and parts of Kent. Half of the distance covered is over gently undulating terrain, with some hills and bends. Often traffic is slow-moving, particularly on weekdays on the single carriageway stretches; and in summer with holiday traffic. Because of this, people have described the A21 as "a joke" and businesspeople have been reported to "hate coming down the A21". There have been many proposals to upgrade parts of the A21 in response to this.

M26 motorway road in England

The M26 is a motorway in Kent, England. It provides a short link between the M25 at Sevenoaks and the M20 near West Malling.

The radial distance from London (taken as Charing Cross) varies from 12.5 miles (20.1 km) in Potters Bar to 19.5 miles (31.4 km) in Byfleet. Three Greater London boroughs (Enfield, Hillingdon and Havering) have realigned their boundaries to the M25 for minor stretches; while in others, most notably in Essex and Surrey, the radial gap between Greater London and the motorway reaches 7.8 miles (12.6 km), [5] neither of which coincide with the Metropolitan Green Belt. Major towns listed as destinations (right), in various counties, adjoin the M25. North Ockendon is the only settlement of Greater London situated outside the M25. In 2004, following an opinion poll, the London Assembly mooted for consultation alignment of the Greater London boundary with the M25. [6] "Inside the M25" and "outside/beyond the M25" are colloquial, looser alternatives to "Greater London" sometimes used in haulage. The Communications Act 2003 explicitly uses the M25 as the boundary in requiring a proportion of television programmes to be made outside the London area. [7]

Two motorway service areas are on the M25, and two others are directly accessible from it. Those on the M25 are Clacket Lane between junctions 5 and 6 (in the south-east) and Cobham between junctions 9 and 10 (in the south-west). Those directly accessible from it are South Mimms off junction 23 (to the north of London) and Thurrock off junction 31 (to the east of London). Cobham services opened on 13 September 2012. [8] [9]

Originally, the M25 was unlit except for sections around Heathrow, major interchanges and Junctions 23–30. Originally, low pressure sodium (SOX) lighting was the most prominent technology used, but widening projects from the 1990s onwards have all used high-pressure sodium (SON) lighting and this has diminished the original installations. By 2014 only one significant stretch was still SOX-lit (Junction 25–26) and the units were removed the same year.

The motorway passes through five counties. Junctions 1A–5 are in Kent, 6–14 are in Surrey, 15–16 are in Buckinghamshire, 17–25 are in Hertfordshire, and 26–31 are in Essex. Policing of the road is carried out by an integrated policing group made up of the Metropolitan, Thames Valley, Essex, Kent, Hertfordshire and Surrey forces.

The M25 is one of Europe's busiest motorways. In 2003, a maximum of 196,000 vehicles a day were recorded on the motorway just south of London Heathrow Airport between junctions 13 and 14. [10]

History

Plans

Map of Ringways 3 & 4 showing sections combined to form the M25 Ringways 3 & 4.png
Map of Ringways 3 & 4 showing sections combined to form the M25

The idea of an orbital road around London was first proposed early in the 20th century. An outer orbital road around London had first been proposed in 1913, and was re-examined as a motorway route in Sir Charles Bressey's and Sir Edwin Lutyens' The Highway Development Survey, 1937. [11] Sir Patrick Abercrombie's County of London Plan, 1943 and Greater London Plan, 1944 proposed a series of five roads encircling the capital. [12] [13] The northern sections of the M25 follow a similar route to the World War II Outer London Defence Ring, a concentric series of tanks and pillboxes designed to slow down a potential German invasion of the capital. [14]

Little was done to progress these plans until the 1960s when the Greater London Council developed its London Ringways plan [15] consisting of four "rings" around the capital. Sections of the two outer rings Ringway 3 (the 'M16 motorway') and Ringway 4  – were constructed in the early 1970s and were integrated into the single M25 orbital motorway. But the Ringways plan was hugely controversial owing to the destruction required for the inner two ring roads, (Ringway 1 and Ringway 2). Parts of Ringway 1 were constructed (including West Cross Route), against stiff opposition, before the overall plan was abandoned in 1973 following pressure from residents in the threatened areas.

Construction

View north from Higher Denham Fire Station at Tatling End on the A40 in July 1984, with the Chiltern Main Line five-arch 1906 Chalfont Viaduct, originally built to straddle the River Misbourne M25 - Work In Progress at Tatling End - geograph.org.uk - 37213.jpg
View north from Higher Denham Fire Station at Tatling End on the A40 in July 1984, with the Chiltern Main Line five-arch 1906 Chalfont Viaduct, originally built to straddle the River Misbourne
View east at the Chandler's Cross Interchange in December 2005 of the former A405 from this junction (19) to the Maple Cross Interchange (17) M25 Motorway Link Road, Chandler's Cross - geograph.org.uk - 92339.jpg
View east at the Chandler's Cross Interchange in December 2005 of the former A405 from this junction (19) to the Maple Cross Interchange (17)

Construction of parts of the two outer ring roads, Ringways 3 and 4, began in 1973. The first section, between South Mimms and Potters Bar in Hertfordshire (junction 23 to junction 24) opened in September 1975 and was given the temporary general purpose road designation A1178 (a section of motorway-standard-road, originally the M16, which eventually was incorporated into the M25) was completed and operational before this. A Watford-avoiding route between the M1 and the A40 between north Watford and Denham was locally known as the Croxley Green/Rickmansworth bypass, and was operational about 1973/4; a section south of London (junction 6 to junction 8) opened in 1976. A section of Ringway 3 south of the river between Dartford and Swanley (junction 1 to junction 3) was constructed between 1974 and 1977. In 1975 the plans for Ringway 3 were modified to combine it with Ringway 4, the outermost Ringway. The M25 as a component of ringway 4, was first conceived to be an east-west road south of London to relieve the A25, and running parallel to it, with its eastern end following the route of what is now the M26. However, it was subsequently routed northwards towards the Dartford Tunnel to form, in conjunction with similar roads, including the M16 planned to the north of London, part of the London Orbital. [4] The combined motorway was given the designation M25 which had originally been intended for the southern and western part of Ringway 4 and the M16 designation was dropped. The section of Ringway 3 west of South Mimms anti-clockwise around London to Swanley in Kent was cancelled. The stages were not constructed contiguously but in small sections. As the orbital road developed the sections were linked. Each section was presented to planning authorities in its own right and was individually justified, with almost 40 public inquiries relating to sections of the route. Maps at this time depicting these short sections named the route as the M16 but this changed before completion.

The section from Potters Bar to the Dartford Tunnel was constructed between 1979 and 1982. Construction of the M25 continued in stages until its completion in 1986. Prime Minister Margaret Thatcher officially opened the M25 on 29 October 1986, with a ceremony in the section between J22 and J23 (London Colney and South Mimms). The initial tenders for the construction of the M25 totalled £631.9 million. This did not include compulsory purchase of land and subsequent upgrades and repairs.[ citation needed ]

Operational history

The M4/M25 motorway junction, near Heathrow Airport M4 M25 junction.jpg
The M4/M25 motorway junction, near Heathrow Airport
The M25 between junction 24 (A111, Potters Bar) and 25 (A10, Waltham Cross & Enfield) M25-j24to25.jpg
The M25 between junction 24 (A111, Potters Bar) and 25 (A10, Waltham Cross & Enfield)

Soon after the motorway opened in 1986 traffic levels exceeded the maximum design capacity and in 1990 the Secretary of State for Transport announced plans to widen the whole of the M25 to four lanes. [16] By 1993 the motorway, which was designed for a maximum of 88,000 vehicles per day, was carrying 200,000 vehicles per day. [17] 15% of UK motorway traffic volume was on the M25 and there were plans to add six lanes to the section from Junctions 12 to 15 as well as widening the rest of the motorway to four lanes. [18]

In parts, particularly the western third this plan went ahead, due to consistent congestion. Again, however, plans to widen further sections to eight lanes (four each way) were scaled back in 2009 in response to rising costs. The plans were reinstated in the agreed Highways Agency 2013-14 business plan. [19]

In 1995 a contract was awarded to widen the section between Junctions 8 and 10 from six to eight lanes for a cost of £93.4 million [20] and a Motorway Incident Detection and Automatic Signalling (MIDAS) system was introduced to the M25 from Junction 10 to Junction 15 at a cost of £13.5m in 1995. This was then extended to Junction 16 at a cost of £11.7m in 2002. This consists of a distributed network of traffic and weather sensors, speed cameras and variable-speed signs that control traffic speeds with little human supervision, and has improved traffic flow slightly, reducing the amount of start-stop driving. [21]

The M25 between junctions 7 (M23) and 6 (A22) near Redhill, Surrey. The signs are indicating an advisory reduced speed of 40 mph (64 km/h) due to congestion. CongestionM25.jpg
The M25 between junctions 7 (M23) and 6 (A22) near Redhill, Surrey. The signs are indicating an advisory reduced speed of 40 mph (64 km/h) due to congestion.

In 1995 there was a proposal to widen the section close to Heathrow Airport to fourteen lanes. This attracted fierce opposition from road protesters opposing the Newbury Bypass and other schemes [22] and it was cancelled shortly afterwards. [23] In 1997, however, the Department of Transport announced new proposals to widen the section between Junction 12 (M3) and Junction 15 (M4) to twelve lanes. At the Terminal Five public inquiry a Highways Agency official said that the widening was needed to accommodate traffic to the proposed new terminal, however the transport minister said that no such evidence had been given. [24] Environmental groups objected to the decision to go ahead with a scheme that would create the widest motorways in the UK without holding a public inquiry. [25] The decision was again deferred. A decision to go-ahead was given for a ten-lane scheme in 1998 [26] and the £148 million 'M25 Jct 12 to 15 Widening' contract was awarded to Balfour Beatty in 2003. [27] The scheme was completed in 2005 as dual-five lanes between Junctions 12 and 14 and dual-six lanes from Junctions 14 to 15. [28]

The M25 motorway looking south between junctions 14 and 15, near Heathrow Airport. The red light from the overhead gantry, just visible in the distance, is the MIDAS system indicating a reduced speed limit due to congestion. Autoroute M25.jpg
The M25 motorway looking south between junctions 14 and 15, near Heathrow Airport. The red light from the overhead gantry, just visible in the distance, is the MIDAS system indicating a reduced speed limit due to congestion.

In 2007 capacity at Junction 25 (A10/Waltham Cross) was increased and the Holmesdale Tunnel was widened to three lanes in an easterly direction at a cost of £75 million. [29]

Work to widen the exit slip-roads in both directions at Junction 28 (A12 road/A1023) was completed in 2008. It was designed to reduce the amount of traffic queueing on the slip roads at busy periods, particularly traffic from the clockwise M25 joining the northbound A12 where the queue extended onto the inside lane of the Motorway. [30]

Design, Build, Finance and Operate (DBFO) contract

In 2006 the Highways Agency proposed to widen 63 miles (101 km) of M25 from six to eight lanes, between junctions 5–6 and 16–30 as part of a Design, Build, Finance and Operate (DBFO) project. [31] A shortlist of contractors was announced in October 2006 for the project which was expected to cost £4.5 billion. [32] Contractors were asked to resubmit their bids in January 2008 [33] and in June 2009 the new transport minister indicated that the cost had risen to £5.5 billion and the benefit to cost ratio had dropped considerably. [34] In January 2009 the government announced that plans to widen the sections from Junction 5–7 and from 23–27 had been 'scrapped' and that hard shoulder running would be introduced instead. However widening was reinstated to four lanes in the 2013–14 Highways Agency Business Plan. [2] [35]

In 2009 a £6.2 billion M25 DBFO private finance initiative contract [36] was awarded to Connect Plus to widen the sections between junctions 16 and 23 and between junctions 27 and 30 and maintain the M25 and the Dartford Crossing for a 30-year period. [37]

A control room for the M25 J5-7 Smart Motorways scheme, 2014. Highways Agency Smart Motorways control centre.jpg
A control room for the M25 J5-7 Smart Motorways scheme, 2014.

Works to widen the section between Junctions 16 (M40) and 23 (A1(M)) to dual four lanes [38] started in July 2009 at an estimated cost of £580 million. [39] The Junction 16 to 21 (M1) section was completed by July 2011 and the Junction 21 to 23 by June 2012. [40] Works to widen the Junctions 27 (M11) to 30 (A13) section to dual four lanes also started in July 2009. The Junction 27 to 28 (A12) section was completed in July 2010, [41] the Junction 28 to 29 (A127) in June 2011 and finally the Junction 29 to 30 (A13) section opened in May 2012. [42]

Works to introduce managed motorway technology and permanent hard shoulder running on two sections of the M25 began in 2013. The first section between Junctions 5 (A21/M26) and 7 (M23) started construction in May 2013 with the scheme being completed and opened in April 2014. [43] The second section, between Junctions 23 (A1/A1(M)) and 27 (M11), began construction in February 2013 and was completed and opened in November 2014. [44]

Developments recently constructed

Junction 30 improvement

Inside the Bell Common Tunnel near Epping Bell Common Tunnel - geograph.org.uk - 53233.jpg
Inside the Bell Common Tunnel near Epping

In December 2016 Highways England completed the capacity project at Junction 30 (Thurrock) as part of the Thames Gateway Delivery Plan. [45]

The improved junction is said to facilitate billions of pounds of investment in the region, making journeys more reliable and improving safety. In addition, the A13 through the junction has been widened to four lanes in each direction with speed limits capped to 50 mph. New dedicated link roads created and existing slip roads improved to facilitate east bound migration to the Regional Shopping Centre (Lakeside). Drainage, safety barriers and lighting on the M25 have also been upgraded as part of the improvements around Junction 30 and 31 including new electronic gantry signage.

Project Timeline

August 2014 to December 2014Advance scheme work
December 2014Award of design and build contract
Late February 2015Start of works on A13
November 2015Start of works on M25
December 2016Completion of works

Conditional proposals

Lower Thames Crossing

In 2009 the Department for Transport published options for a new Lower Thames Crossing to add capacity to the Dartford Crossing or create a new road and crossing linking to the M2 and M20 motorways. [46]

Comparisons

The M25 is the second-longest ring road in Europe, after the Berlin Ring (A 10), which is 5 miles (8.0 km) longer.

Other cities in the UK encircled by motorways include: Birmingham, using parts of the M5, M6 and M42, and Manchester, using the M60. Additionally, from 2011 Glasgow has an orbital motorway made of the M8, M73 and M74, although one section of the route passes through the centre of the city. [47]

The M25 is one of the busiest motorways in Europe. Here are some comparisons:

The multi-level stack interchange junction with the M23, viewed from a nearby footbridge to the west M23-M25 Intersection - geograph.org.uk - 15455.jpg
The multi-level stack interchange junction with the M23, viewed from a nearby footbridge to the west

Iain Sinclair's 2002 book and film London Orbital is based on a year-long journey around the M25 on foot. [50]

The M25 (including the A282 Dartford Crossing) is known for its frequent traffic jams. These have been the subject of so much comment from such an early stage that even at the official opening ceremony Margaret Thatcher complained about "those who carp and criticise". The jams have inspired jokes (e.g., "the world's first circular car park", "the London Orbital Car Park", "the biggest Car Park in Europe") and songs (e.g., Chris Rea's "The Road to Hell"). [51]

The M25 plays a role in the comedy-fantasy novel Good Omens , as "evidence for the hidden hand of Satan in the affairs of Man". [52] The demon character, Crowley, had manipulated the design of the M25 to resemble a Satanic sigil, and tried to ensure it would anger as many people as possible to drive them off the path of good. [53] [54]

The M25 enjoyed a more positive reputation among ravers in the late 1980s, when this new orbital motorway became a popular route to the parties that took place around the outskirts of London. This use of the M25 for these raves inspired the name of electronic duo Orbital. [55]

Racing

M25 at junction 30 near Purfleet, Essex Dusk on the M25 - geograph.org.uk - 397818.jpg
M25 at junction 30 near Purfleet, Essex

The orbital nature of the motorway, in common with racetracks, lent itself to unofficial, and illegal, motor racing. At the end of the 1980s, before the advent of speed enforcement devices, owners of supercars would meet at night at service stations such as South Mimms and conduct time trials. Times below 1 hour were achieved - an average speed of over 117 mph (188 km/h), which included coming to a halt at the Dartford Tunnel road user charge payment booths. [56] [57]

Junctions

Data from driver location signs provide carriageway identifier information. [58] The numbers on the signs are kilometres from a point near the River Thames, east of London, when travelling clockwise on the motorway. The table below gives details of each junction, including the roads interchanged and the destinations that are signed from the motorway on the blue advance direction signs. Figures in kilometres are from the driver location signs; figures in miles are derived from them.

A282 – Dartford Crossing (Kent)(M25)
mileskm [58] Clockwise exits (A carriageway) [58] JunctionAnti-clockwise exits (B carriageway)European Route
Dartford Crossing South
Queen Elizabeth II Bridge (Toll)
River
Thames
Dartford Crossing North
Dartford Tunnels (Toll)
Tabliczka E15.svg European route E15
3.55.7 Erith A206 J1AErith A206, Swanscombe (A226) Tabliczka E15.svg European route E15
4.77.5 Dartford A225 J1BExit via J2 – Dartford (A225) Tabliczka E15.svg European route E15
M25 motorway – London Orbital
5.58.8London (SE & C), Bexleyheath A2 (W), Canterbury (M2) A2 (E) Ebbsfleet International, Gillingham J2London (SE & C), Bexleyheath A2, Canterbury (M2), Dartford (A225) Ebbsfleet International, Bluewater, Gillingham
Gillingham A2
Dover, Chnl Tnl (M20)
M25(S) (M23)
Rochester A2
Tabliczka E15.svg European route E15
8.714.0London (SE & C) A20
Maidstone, Channel Tunnel, Folkestone M20
Swanley B2173 Tabliczka E15.svg European route E15
J3 Maidstone, Channel Tunnel M20
London (SE & C), Lewisham A20
12.219.6 Bromley A21
Orpington A224
J4Bromley, London (SE & C) A21
Orpington (A224)
Hayes
16.3
16.4
26.2
26.4
Sevenoaks, Royal Tunbridge Wells, Hastings A21J5Maidstone, Channel Tunnel, Dover M26 (M20)
Sevenoaks, Hastings A21
21.033.8 Clacket Lane services Services Clacket Lane services
25.841.6 East Grinstead, Eastbourne, Caterham, Godstone A22
Redhill, Westerham (A25)
J6East Grinstead, Eastbourne, Caterham, Godstone A22
Redhill, Westerham (A25)
28.646.0 Gatwick Airport, Crawley, Brighton, Croydon M23 J7Gatwick Airport, Crawley, Brighton, M23(S), Croydon M23(N)
31.951.4London (S & SW), Reigate, Sutton A217
Kingston (A240)
J8London (S & SW), Reigate, Sutton A217
Kingston (A240)
38.5
39.5
62.0
63.5
Leatherhead A243, Dorking, (A24)J9Leatherhead A243, Dorking (A24)
42.6
43.2
68.6
69.5
Cobham services Services Cobham services
45.072.4London (SW & C), Guildford, Portsmouth A3 J10London (SW & C), Guildford, Kingston A3
49.880.2 Chertsey A317, Woking A320 J11Woking A320, Chertsey A317
52.183.8 Basingstoke, Southampton, Richmond M3 J12Basingstoke, Southampton, Richmond M3
55.288.8London (W & C), Hounslow, Staines A30 J13London (W & C), Hounslow, Staines A30
57.091.8 Heathrow Airport (Terminals 4, 5 and Cargo) A3113 J14Heathrow Airport (Terminals 4, 5 and Cargo) A3113
59.095.0The WEST, Slough, Reading, London (W & C), Heathrow Airport (Terminals 2 and 3) M4 Tabliczka E30.svg European route E30 J15The WEST, Slough, Reading M4(W)
London (W & C), Heathrow Airport (Terminals 2 & 3) M4(E)
Tabliczka E30.svg European route E30
63.8102.6The NORTH, Birmingham, Oxford, Uxbridge, London (W & C) M40 J16Birmingham, Oxford M40(W)
Uxbridge, London (W & C) M40(E)
Tabliczka E30.svg European route E30
68.7110.5 Rickmansworth, Maple Cross (A412)J17Rickmansworth, Maple Cross A412 Tabliczka E30.svg European route E30
69.9112.5 Chorleywood, Amersham A404 J18Chorleywood, Amersham A404 Tabliczka E30.svg European route E30
71.5116.4 Watford A41 J19Exit via J20 – Watford A41 Tabliczka E30.svg European route E30
73.5118.2 Hemel Hempstead, Aylesbury A41J20Hemel Hempstead, Aylesbury, Watford A41 Tabliczka E30.svg European route E30
76.3122.8The North, Luton & Luton Airport M1 J21The North, Luton & Luton Airport M1 Tabliczka E30.svg European route E30
76.9123.7Watford A405
Harrow (M1 South) Tabliczka E13.svg European route E13
J21A St Albans A405
London (NW & C) (M1 (South))
Tabliczka E30.svg European route E30
80.6129.7London Colney A1081 J22St Albans A1081 Tabliczka E30.svg European route E30
83.3134.0 Hatfield A1(M), London (NW & C) A1, Barnet A1081
South Mimms services
J23Hatfield A1(M), London (NW & C) A1, Barnet A1081
South Mimms services
Tabliczka E30.svg European route E30
85.9138.2 Potters Bar A111 J24Potters Bar A111 Tabliczka E15.svg Tabliczka E30.svg / European route E15 /European route E30
91.4147.1 Enfield Town, Hertford A10 J25Enfield, Hertford, London (N & C) A10 Tabliczka E15.svg / Tabliczka E30.svg European route E15 /European route E30
94.9152.7 Waltham Abbey, Loughton A121 J26Waltham Abbey, Loughton A121 Tabliczka E15.svg / Tabliczka E30.svg European route E15 / European route E30
99.2159.7London (NE & C), Stansted Airport, Harlow, Cambridge M11 J27 London (NE & C) M11(N), Stansted Airport, Harlow, Cambridge M11(S) Tabliczka E15.svg / Tabliczka E30.svg European route E15 /European route E30
107.1172.4 Chelmsford, Witham, Colchester A12
Brentwood A1023 Tabliczka E30.svg European route E30
J28Chelmsford, Romford A12
Brentwood A1023
Tabliczka E15.svg European route E15
109.9176.8Romford, Basildon, Southend A127 J29Basildon, Southend, Romford A127 Tabliczka E15.svg European route E15
115.2185.4Tilbury, Thurrock, Lakeside A13(E), London (E & C) A13(W)
Thurrock services
J30 London (E & C), Barking, Tilbury, Basildon, Dagenham, Rainham A13 Tabliczka E15.svg European route E15
A282 Road – Dartford Crossing
115.9186.6Exit via J30 – Purfleet (A1090), South Ockendon, Thurrock services A1306J31 Thurrock (Lakeside), Thurrock services A1306, Purfleet (A1090), West Thurrock (A126) Tabliczka E15.svg European route E15
Dartford Crossing South
Queen Elizabeth II Bridge (Toll)
River
Thames
Dartford Crossing North
Dartford Tunnels (Toll)
Tabliczka E15.svg European route E15
Notes
  • Distances in kilometres and carriageway identifiers are obtained from driver location signs/location marker posts. Where a junction spans several hundred metres and the data is available, both the start and finish values for the junction are shown.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

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References

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Sources

Further reading

Route map:

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