Junctions edit

County Location mi km Junction Destinations Notes
Greater London Staples Corner 7.0 11.3 1   A406  - North Circular (W), Brent Cross, Wembley, Hanger Lane;
  A41  - West End
Start of motorway
Five Ways Corner 9.1 14.6 2   A406  - North Circular (E)
  A1  - Central London (The City)
Southbound exit and northbound entrance only
Edgware 12.0 19.3 Services London Gateway services
Brockley 13.2 12.3 4   A41  - Edgware, Harrow Southbound exit and northbound entrance only
Hertfordshire Watford 17.1 27.5 5   A4008  - Watford
  A41  - Aylesbury, Bushey
Watford 19.7 31.7 6   A405  - North Watford, St Albans
  M25  - M25 (E)
Chiswell Interchange 20.4 32.9 6a   M25  - Standsted  , Dartford, Heathrow  , M40, M4, M3 Southbound exit and northbound entrance only
Hemel Hempstead 22.5 36.2 7   A414  - St Albans, Hatfield Southbound exit and northbound entrance only
Hemel Hempstead 23.5 37.8 8   A414  - Hemel Hempstead
Harpenden 27.9 44.9 9   A5183  - Dunstable, Redbourn
Bedfordshire Luton 30.3 48.8 10   A1081  - Luton (S), Luton Airport  
Luton 33.7 54.3 11   A505  - Luton (C), Dunstable
Luton 35.9 57.8 11a   A5  - Aylesbury, Houghton Regis
  A5505  - Dunstable
Toddington 37.9 61.0 Services Toddington services
Toddington 38.5 62.0 12   A5120  - Flitwick, Houghton Regis, Woburn
Milton Keynes 45.2 72.7 13   A421  - Milton Keynes (S), Bedford
  A507  - Ampthill, Woburn
Buckinghamshire Milton Keynes 49.7 80.0 12   A509  - Milton Keynes, Newport Pagnell
Newport Pagnell 53.7 86.5 Services Newport Pagnell services
1.000 mi = 1.609 km; 1.000 km = 0.621 mi