Editing M25 motorway (section)

==Junctions and services==
Data from [[driver location signs]] provide carriageway identifier information.<ref name=DLS>{{cite web|url=http://www.highways.gov.uk/business/documents/070921-Final_DLS_map.pdf |title=M25 Road Network Driver Location Signs |publisher=[[Highways Agency]]  |access-date=9 June 2009 |url-status=dead |archive-url=https://web.archive.org/web/20110605140242/http://www.highways.gov.uk/business/documents/070921-Final_DLS_map.pdf |archive-date=5 June 2011 }}</ref> The numbers on the signs are kilometres from a point on the north side of the Dartford Crossing, while the letter is "A" for the clockwise carriageway and "B" for the anticlockwise. They are spaced every {{convert|500|metres}}.{{sfn|Hamilton|2015|p=26}}

The M25 has been criticised for having too many junctions; 14 of them serve only local roads.{{sfn|Asher|2018|p=117}}<ref>{{cite book|title=Orbital Motorways: Proceedings of the Conference Organized by the Institution of Civil Engineers and Held in Stratford-upon-Avon on 24–26 April 1990|page=131|publisher=Thomas Telford|year=1990|isbn=978-0-727-71591-3}}</ref> In 2016, [[Edmund King (campaigner)|Edmund King]], president of the [[The Automobile Association|Automobile Association]], attributed congestion on the M25 to excessive junctions. This leads to "junction hoppers" who only use the motorway for a short distance before exiting;{{sfn|Moran|2005|p=99}} their difference in speed when entering and leaving the main carriageway causes a [[domino effect]], resulting in all vehicles slowing down.<ref>{{cite news|url=https://www.standard.co.uk/news/transport/plan-for-smart-junctions-to-end-gridlock-on-m25-a3222156.html|title=Plan for "smart" junctions to end gridlock on the M25|work=London Evening Standard|date=11 April 2016|access-date=28 May 2019}}</ref> Drivers who only use the M25 to travel a short distance are believed by some to have less overall driving experience, exacerbating traffic and safety issues.{{sfn|Moran|2005|p=99}}

The M25 originally opened without any service areas. The first, at [[South Mimms services|South Mimms]], was opened by Margaret Thatcher in June 1987, a week before the election. Thatcher admired the practical and no-frills architecture of [[Charles Forte]] and praised him in her opening speech.{{sfn|Moran|2009|p=156}} The second, [[Clacket Lane services|Clacket Lane]], was opened by [[Robert Key (politician)|Robert Key]], Minister for Roads and Traffic, on 21 July 1993.{{sfn|Baldwin|Bridle|Baldwin|Porter|2002|p=938}} Construction was delayed as the remains of a [[Roman villa]] were found on the site, requiring archaeological research.{{sfn|Baldwin|Bridle|Baldwin|Porter|2002|p=764}} The other service area between junctions is [[Cobham services|Cobham]], which opened on 13 September 2012.<ref name=CobhamOpen/>

{| class="wikitable"
|- align="center" bgcolor="00703C" style="color: #FFD200;"
| colspan="6" | A282 (Dartford Crossing)
|-
!scope=col| miles
!scope=col| km<ref name=DLS />{{efn|The table 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.}}
!scope=col| Clockwise exits (A carriageway)<ref name=DLS />
!scope=col| Junction
!scope=col| Anti-clockwise exits (B carriageway)
!scope=col| Opening date{{sfn|Asher|2018|p=121}}
|- align="center"
|0.0
|0.0
|style="background:#dcdcfe;"| [[Dartford Crossing]] South<br />(Queen Elizabeth II Bridge)<br />[[File:UK traffic sign symbol NS67.svg|40px]]
! scope=row| [[River Thames|River<br />Thames]]
|style="background:#dcdcfe;"| Dartford Crossing North<br />(Dartford Tunnels)<br />[[File:UK traffic sign symbol NS67.svg|40px]]
| November 1963 (west tunnel)<br />May 1980 (east tunnel)<br />October 1991 (bridge)
|- style="text-align:center;"
|
|
|  ''Entering [[Kent]]''
|
|  ''Entering [[Essex]]''
| 
|- align="center"
|3.5
|5.7
| [[Swanscombe]], [[Erith]], [[Bluewater (shopping centre)|Bluewater]] [[A206 road|A206]]
! scope=row| J1A{{efn|Junctions 1A and 1B are part of the A282, though they use the M25's numbering scheme.<ref>{{cite web|url=https://www.roads.org.uk/motorway/m25|title=M25|website=roads.org.uk|access-date=19 July 2019}}</ref>}}
| Swanscombe, Erith A206
| September 1986
|- align="center"
|4.7
|7.5
| [[Dartford]] [[A225 road|A225]]
! scope=row| J1B
|{{no2}} '''No Exit'''
| September 1986
|- align="center" bgcolor="0080d0" style="color: white;"
| colspan="6" | M25
|-
|- align="center"
|5.5
|8.8
|  [[London]] (SE & C), [[Bexleyheath]] [[A2 road (Great Britain)|A2]]<br />[[Canterbury]] ([[M2 motorway (Great Britain)|'''M2''']])<br />''[[Ebbsfleet International]] [[File:British Rail - colour reversed logo.svg|x15px]]''<br /><br />''Non Motorway Traffic''
! scope=row| J2
|  London (SE & C), Bexleyheath, [[Bluewater (shopping centre)|Bluewater]] [[A2 road (Great Britain)|A2]]<br /> Canterbury ([[M2 motorway (Great Britain)|'''M2''']])<br />[[Dartford]] ([[A225 road|A225]])<br />''Ebbsfleet International [[File:British Rail - colour reversed logo.svg|x15px]]''
|September 1986 (northbound)<br />April 1977 (southbound)
|- align="center"
|8.7
|14.0
| [[Dover]], [[Channel Tunnel]], [[Maidstone]] [[M20 motorway|'''M20''']]<br />[[London]] (SE), [[Swanley]] [[A20 road (England)|A20]]
! scope=row| J3
| London (SE & C), [[Lewisham]] A20<br />Channel Tunnel, Maidstone '''M20'''
|April 1977 (northbound)<br />February 1986 (southbound)
|- align="center"
|12.2
|19.6
| [[Bromley]] [[A21 road (England)|A21]]<br />[[Orpington]] [[A224 road|A224]]
! scope=row| J4
| [[London]] (SE), Bromley A21<br />Orpington A224
| February 1986
|- align="center"
|16.3<br />16.4
|26.2<br />26.4
| [[Sevenoaks]], [[Hastings]] [[A21 road (England)|A21]]
! scope=row| J5
| [[Dover]], [[Channel Tunnel]], [[Maidstone]]<br />[[M26 motorway|'''M26''']] ([[M20 motorway|'''M20''']])<br />Sevenoaks, Hastings A21
| July 1980
|- style="text-align:center;"
|
|
|  ''Entering [[Surrey]]''
|
|  ''Entering [[Kent]]''
| 
|- align="center"
|21.0
|33.8
|[[Clacket Lane services]]
! scope=row| Services
|[[Clacket Lane services]]
|July 1993
|- align="center"
|25.8
|41.6
| [[Eastbourne]], [[Godstone]], [[Caterham]] [[A22 road|A22]]<br />[[Redhill, Surrey|Redhill]], [[Westerham]] ([[A25 road|A25]])
! scope=row| J6
| Eastbourne, Godstone, Caterham A22<br />Westerham (A25)
| November 1979 (eastbound)<br />February 1976 (westbound)
|- align="center"
|28.6
|46.0
| [[Brighton]], [[Crawley]]<br />[[Gatwick Airport|Gatwick]] {{rail-interchange|air}}<br />[[Croydon]]<br />[[M23 motorway|'''M23''']]
! scope=row| J7
| Croydon<br />Brighton, Gatwick {{rail-interchange|air}}<br />'''M23'''
| February 1976
|- align="center"
|31.9
|51.4
| [[Reigate]], [[Sutton, London|Sutton]] [[A217 road|A217]]<br />[[Kingston upon Thames|Kingston]] ([[A240 road|A240]])
! scope=row| J8
| Reigate, Sutton A217 <br />Redhill (A25)
| February 1976 (eastbound)<br />October 1985 (westbound)
|- align="center"
|38.5<br />39.5
|62.0<br />63.5
| [[Leatherhead]] [[A243 road|A243]]<br />[[Dorking]] ([[A24 road (Great Britain)|A24]])
! scope=row| J9
| Leatherhead A243<br />Dorking (A24)
| October 1985
|- align="center"
|42.6<br />43.2
|68.6<br />69.5
| [[Cobham services]]
! scope=row| Services
|[[Cobham services]]
|September 2012
|- align="center"
|45.0
|72.4
| [[Portsmouth]], [[Guildford]], [[London]] (SW & C)<br />[[A3 road|'''A3''']]
! scope=row| J10
| London (SW), Kingston, Guildford, Portsmouth<br />[[A3 road|'''A3''']]
| October 1985 (eastbound)<br />December 1983 (westbound)
|- align="center"
|49.8
|80.2
| [[Woking]] [[A320 road|A320]]<br />[[Chertsey]] [[A317 road|A317]]
! scope=row| J11
| Chertsey A317<br />Woking A320
| December 1983 (southbound)<br />October 1980 (northbound)
|- align="center"
|52.1
|83.8
| [[Basingstoke]], [[Southampton]]<br />[[Richmond, London|Richmond]]<br />[[M3 motorway (Great Britain)|'''M3''']]
! scope=row| J12
| The SOUTH WEST, Southampton<br />London (SW & C), Richmond<br />'''M3'''
| October 1980 (southbound)<br />December 1976 (northbound)
|- style="text-align:center;"
|
|
|  ''Entering [[Berkshire]]''
|
|  ''Entering [[Surrey]]''
| 
|- style="text-align:center;"
|
|
|  ''Entering [[Surrey]]''
|
|  ''Entering [[Berkshire]]''
| 
|- align="center"
|55.2
|88.8
| [[London]] (W), [[Hounslow]], [[Staines-upon-Thames|Staines]] [[A30 road|A30]]
! scope=row| J13
| London (W), Hounslow, Staines A30
| November 1981 (southbound)<br />August 1982 (northbound)
|- style="text-align:center;"
|
|
|  ''Entering [[Greater London]]''
|
|  ''Entering [[Surrey]]''
| 
|- align="center"
|57.0
|91.8
| [[Heathrow Airport|Heathrow]] {{rail-interchange|air}}<br />(Terminals 4, 5 & Cargo) [[A3113 road|A3113]]
! scope=row| J14
| Heathrow {{rail-interchange|air}} (Terminals 4, 5 & Cargo) [[A3113 road|A3113]]
| August 1982 (southbound)<br />September 1985 (northbound)
|- style="text-align:center;"
|
|
|  ''Entering [[Buckinghamshire]]''
|
|  ''Entering [[Greater London]]''
| 
|- align="center"
|59.0
|95.0
| The WEST, [[Reading, Berkshire|Reading]], [[Slough]]<br />[[London]] (W & C), [[Heathrow Airport|Heathrow]] {{rail-interchange|air}} (Terminals 1, 2 & 3)<br />[[M4 motorway|'''M4''']] 
! scope=row| J15
| London (W), Heathrow {{rail-interchange|air}} (Terminals 1, 2 & 3)<br />The WEST, Slough, Reading<br />'''M4'''
| September 1985
|- align="center"
|63.8
|102.6
|  [[Birmingham]], [[Oxford]]<br />[[Uxbridge]], [[London]] (W)<br />[[M40 motorway|'''M40''']]
! scope=row| J16
|  Uxbridge, London (W & C)<br />Birmingham, Oxford<br />'''M40'''
| September 1985 (southbound)<br />January 1985 (northbound)
|- style="text-align:center;"
|
|
|  ''Entering [[Hertfordshire]]''
|
|  ''Entering [[Buckinghamshire]]''
|
|- align="center"
|68.7
|110.5
| [[Rickmansworth]], [[Maple Cross]] A412
! scope=row| J17
| Maple Cross A412
| January 1985 (southbound)<br />February 1976 (northbound)
|- align="center"
|69.9
|112.5
| [[Amersham]], [[Chorleywood]] [[A404 road|A404]]
! scope=row| J18
| Amersham, Chorleywood, Rickmansworth A404
| February 1976
|- align="center"
|71.5
|116.4
| [[Watford]] [[A41 road|A41]]
! scope=row| J19
|{{no2}} Exit via J20 – Watford A41
| September 1976
|- align="center"
|73.5
|118.2
| [[Aylesbury]], [[Hemel Hempstead]] A41
! scope=row| J20
| Aylesbury, Hemel Hempstead, Watford A41
| August 1986
|- align="center"
|76.3
|122.8
| The NORTH<br />[[London Luton Airport|Luton]] {{rail-interchange|air}}<br />[[M1 motorway|'''M1''']]
! scope=row| J21
| The NORTH<br />Luton {{rail-interchange|air}}<br />'''M1'''
| August 1986
|- align="center"
|76.9
|123.7
| (M1 South)<br />[[St Albans]], [[London]] (NW & C) [[A405 road|A405]]
! scope=row| J21A
| (M1 South)<br />St Albans, London (NW & C), Watford A405
| August 1986
|- align="center"
|80.6
|129.7
| [[St Albans]] [[A1081 road|A1081]]
! scope=row| J22
| St Albans A1081
| August 1986
|- align="center"
|83.3
|134.0
| [[Hatfield, Hertfordshire|Hatfield]] [[A1(M) motorway|'''A1(M)''']]<br />[[London]] (N & C) [[A1 road (Great Britain)|A1]]<br />[[Chipping Barnet|Barnet]] [[A1081 road|A1081]]<br />''[[South Mimms services]]''
! scope=row| J23
| London (N & C) A1<br />Barnet A1081<br />Hatfield '''A1(M)'''<br />''South Mimms services''
| August 1986 (westbound)<br />September 1975 (eastbound)
|- align="center"
|85.9
|138.2
| [[Potters Bar]] [[A111 road (England)|A111]]
! scope=row| J24
| Potters Bar A111
| September 1975 (westbound)<br />June 1981 (eastbound)
|- style="text-align:center;"
|
|
|  ''Entering [[Greater London]]''
|
|  ''Entering [[Hertfordshire]]''
| 
|- align="center"
|91.4
|147.1
| [[London]] (N & C)<br />[[Enfield Town|Enfield]], [[Hertford]] [[A10 road (England)|A10]]
! scope=row| J25
| London (N & C)<br />Enfield, Hertford A10
| June 1981 (westbound)<br />January 1984 (eastbound)

|- align="center"
|
|
| ''Holmesdale Tunnel''
! scope=row| ''Tunnel''
| ''Holmesdale Tunnel''
| January 1984
|- align="center"

|- style="text-align:center;"
|
|
|  ''Entering [[Essex]]''
|
|  ''Entering [[Greater London]]''
| 
|- align="center"
|94.9
|152.7
| [[Waltham Abbey (town)|Waltham Abbey]], [[Loughton]] [[A121 road (England)|A121]]
! scope=row| J26
| Waltham Abbey, Loughton A121
| January 1984
|- align="center"
|
|
| ''Bell Common Tunnel''
! scope=row| ''Tunnel''
| ''Bell Common Tunnel''
| January 1984
|- align="center"


|99.2
|159.7
| [[Cambridge]], [[Stansted Airport|Stansted]] {{rail-interchange|air}}, [[Harlow]]<br />[[London]] (N & E)<br />[[M11 motorway|'''M11''']]
! scope=row| J27
| London (NE & C)<br />Cambridge, Harlow, Stansted {{rail-interchange|air}}<br />'''M11'''
| January 1984 (westbound)<br />April 1983 (eastbound)
|- style="text-align:center;"
|
|
|  ''Entering [[Greater London]]''
|
|  ''Entering [[Essex]]''
| 
|- align="center"
|107.1
|172.4
| [[Chelmsford]], [[London]] (E & C), [[Romford]] [[A12 road (England)|A12]] <br />[[Brentwood, Essex|Brentwood]] [[A1023 road|A1023]] 
! scope=row| J28
| Chelmsford A12<br />Brentwood A1023
| April 1983
|- style="text-align:center;"
|
|
|  ''Entering [[Essex]]''
|
|  ''Entering [[Greater London]]''
| 
|- style="text-align:center;"
|
|
|  ''Entering [[Greater London]]''
|
|  ''Entering [[Essex]]''
| <small>{{coord|54.17005|N|2.73748|W|dim:4000_region:GB|display=inline}}</small>
|- align="center"
|109.9
|176.8
| [[Southend]], [[Southend Airport]] {{rail-interchange|air}}, [[Basildon]] [[A127 road|A127]]
! scope=row| J29
| [[London]] (E & C), Romford, Southend, Southend Airport {{rail-interchange|air}}, Basildon A127
| April 1983 (northbound)<br />December 1982 (southbound)
|- style="text-align:center;"
|
|
|  ''Entering [[Essex]]''
|
|  ''Entering [[Greater London]]''
| 
|- align="center"
|115.2
|185.4
| [[Tilbury]], [[Thurrock]], [[Lakeside Shopping Centre|Lakeside]], [[London]] (E & C) [[A13 road (Great Britain)|A13]]<br />''[[Thurrock services]]''
! scope=row| J30
| [[London]] (E & C), Tilbury, Thurrock, Lakeside [[A13 road (Great Britain)|A13]]<br />''Thurrock services''<br /><br />''Non Motorway Traffic''
| December 1982
|- align="center"
|- align="center" bgcolor="00703C" style="color: #FFD200;font-size:120%;"
| colspan="6" | A282 (Dartford Crossing)
|- align="center"
|115.9
|186.6
|{{no2}} '''No Exit'''
! scope=row| J31
| [[Thurrock]], [[Lakeside Shopping Centre|Lakeside]] [[A roads in Zone 1 of the Great Britain numbering scheme|A1306]]<br />[[Purfleet]] ([[A1090 road|A1090]])<br />[[West Thurrock]] ([[A126 road|A126]])<br />''Thurrock services''
| December 1982
|- align="center"
|
|
|style="background:#dcdcfe;"| [[Dartford Crossing]] South<br />(Queen Elizabeth II Bridge)<br />[[File:UK traffic sign symbol NS67.svg|40px]]
! scope=row| [[River Thames|River<br />Thames]]
|style="background:#dcdcfe;"| Dartford Crossing North<br />(Dartford Tunnels)<br />[[File:UK traffic sign symbol NS67.svg|40px]]
| November 1963 (west tunnel)<br />May 1980 (east tunnel)<br />October 1991 (bridge)
|- style="text-align:center;"
|
|
|  ''Entering [[Kent]]''
|
|  ''Entering [[Essex]]''
| 
|-
|colspan=6|'''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.
|-
{{jctbtm|keys=incomplete,toll}}