What Junction is the A20 on the M25?

Leave the M25 at Junction 3 (signed London, A20, Swanley & B2173) - do not join the M20.



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Located on the M20 at junction 8 and serving both sides of the motorway.

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Junctions and service areas
  • Junction 1A (on A282): Greenhithe, Dartford (North).
  • Junction 1B (on A282): Dartford.
  • Junction 2: (Start of Motorway) Gravesend, A2.
  • Junction 3: Swanley, M20.
  • Junction 4: Orpington, Bromley.
  • Junction 5: Sevenoaks, M26.
  • Service Station: Clacket Lane Service Station.
  • Junction 6: Caterham.


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How the M25 got its name. The same principle explains the M25, which at its oldest point (the section crossing Surrey) follows the path of the older A25. These roads are all in the South East, which forms Zone 2 of the country's motorway system. This explains why they all contain 2 somewhere in their name.

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Junction 23 on the M25 in Hertfordshire is the single biggest gyratory on the whole of the National Highways network. At about 1.2km in circumference, the junction sees some of the highest traffic flows on the M25.

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