The next two weeks will see a particularly large number of motorway closures near Watford that could cause delays.

Clockwise journeys on the M25 late at night this week could be delayed by up to 30 minutes due to a closure starting from 10pm tonight between junctions 20 and 21.

It will then shut again at the same time each night - before reopening at 6am - until Saturday morning. The measure is being put in place for resurfacing works, with a diversion sending vehicles down local authority roads.

The next night, a set of northbound M1 closures will start up. From 10pm on July 27 and 28 until 5.30am the following day the motorway will be closed between junction 5 and junction 6a for carriageway repairs.

The same section will then have a lane closure from 10pm on July 29 until 5am on July 30 which could cause up to ten minutes of delays.

See the full list of motorway closures for the next two weeks:

M25 closures:

  • From 10pm July 22 to 6am July 27, moderate delays (10-30 minutes). Clockwise, junction 20 to junction 21. Lane closures, slip road closures and carriageway closure for resurfacing works. Diversion via local authority roads.
  • From 11pm July 19 to 5am July 27, slight delays (under 10 minutes). Anticlockwise, junction 22, slip road closure for street lighting works.
  • From 8pm July 9 to 6am August 1, moderate delays (10-30 minutes). M25 clockwise, junction 23 to junction 24. Lane and slip road closure for NEAR Scheme. Diversion via National Highways roads.
  • From 10pm July 24 to 5.30am July 25, moderate delays (10-30 minutes). M25 clockwise, junction 23. Carriageway closure for improvement works ERA bay scheme. Diversion via National Highways roads.
  • From 10pm July 24 to 5am July 25, slight delays (under 10 minutes). M25 anti clockwise, junction 22 to junction 21. Lane closures for technology replacement works.
  • From 10pm July 25 to 5.30am July 26, slight delays (under 10 minutes). M25 anti-clockwise, junction 23 exit Slip. Lane closure for NEAR scheme.
  • From 10pm August 1 to 5.30am August 31, moderate delays (10-30 minutes). M25 clockwise, junction 23 to junction 24. Lane and slip road closure for NEAR Scheme, diversion via National Highways roads.
  • From 10pm August 1 to 5am August 2, slight delays (under 10 minutes). M25 clockwise, junction 22 to junction 23. Lane closure for technology replacement works.

M1 closures:

  • From 10pm July 27 to 5.30am July 29, moderate delays (10-30 minutes). M1 northbound, junction 5 to junction 6A. Lane and slip road closure for carriageway repairs. Diversion via local authorities.
  • From 10pm July 29 to 5am July 30, slight delays (under 10 minutes). M1 northbound, junction 5 to junction 6. Lane closure for urgent carriageway repairs.
  • From 10pm July 23 to 5am July 24, moderate delays (10-30 minutes). M1 northbound, junction 5 to junction 6, Lane and slip road closure for electrical works. Diversion via local authorities.
  • From 10pm July 24 to 5am July 25, slight delays (under 10 minutes). M1 southbound, junction 5 to junction 4. Lane closure for urgent barrier repairs.
  • From 10pm July 24 to 5am July 25, slight delays (under 10 minutes). M1 northbound, junction 4 to junction 5. Lane closure for urgent safety fence repairs.
  • From 10pm July 29 to 5am July 30, slight delays (under 10 minutes). M1 northbound, junction 5 to junction 6. Lane closure for urgent carriageway repairs.
  • From 10pm August 1 to 5am August 2, slight delays (under 10 minutes). M1 southbound, junction 5 to junction 4. Lane closure for parapet replacements.
  • From 11pm August 2 to 6am August 3, slight delays (under 10 minutes). M1 northbound, junction 4 to junction 5. Lane closure for parapet replacement works.

A1(M) closure:

  • From 10pm July 31 to 5am August 1, moderate delays (10-30 minutes). A1 northbound, junction Rowely Lane to junction 1. Lane and slip road closure for routine works. Diversion via local authorities roads.