A series of M25 closures starting tonight is the first of several motorway road and lane closures for the next fortnight.

Maintenance will be in progress overnight somewhere on the M25, M1, and A1(M) in Hertfordshire every night until the end of this month.

Parts of the National Emergency Area Retrofit (NEAR) scheme, resurfacing, sign works, parapet works, bridge repairs, and electrical works will be taking place during the closures.

A potentially significant closure for Watford residents is due to start at 10pm tonight and continue to 6am each night until August 17, between junction 20 and junction 21 of the clockwise M25.

The carriageway will be closed for resurfacing work and a diversion will take motorists around it via local authority roads, with delays of 10 to 30 minutes expected.

See the full list of planned closures below:

M25

  • From 10pm August 12 to 6am August 17: Moderate delays (10-30 minutes). Clockwise, junction 20 to junction 21. Lane and carriageway closure for resurfacing work. Diversion via local authorities.
  • (In progress) From 10pm August 1 to 5.30am August 31: Moderate delays (10-30 minutes). Clockwise, junction 23 to junction 24. Lane and slip road closure for NEAR Scheme. Diversion via National Highways roads.
  • From 10pm August 19 to 5am August 20: Moderate delays (10-30 minutes). Anti clockwise, junction 25 to junction 24. Lane closures and slip road closures for maintenance works. Diversion via National Highways roads.
  • From 10pm August 20 to 5am August 21: Moderate delays (10-30 minutes). Anti clockwise, junction 24 to junction 23. Lane closures and slip road closure for maintenance works, diversion via National Highways roads.

M1

  • From 10pm August 12 to 5am August 14: Slight delays (under 10 minutes). Northbound, junction 4 to junction 5. Lane closure for electrical works.
  • From 10pm August 12 to 5am August 14: Slight delays (under 10 minutes). Southbound, junction 5 to junction 4. Lane closure for electrical works.
  • From 10pm August 14 to 5.30am August 15: Slight delays (under 10 minutes). Southbound, junction 5 to junction 4. Lane closure for sign works.
  • From 11pm August 16 to 6am August 17: Slight delays (under 10 minutes). Southbound, junction 5 to junction 4. Lane closure for parapet replacement.
  • From 11pm August 16 to 6am August 17: Slight delays (under 10 minutes). Northbound, junction 4 to junction 5. Lane closure for parapet replacement works.
  • From 10pm August 19 to 5am August 20: Slight delays (under 10 minutes). Northbound, junction 4 to junction 5. Lane closure for parapet replacement works.

A1(M)

  • From 9pm August 15 to 5am September 12: Moderate delays (10-30 minutes): Southbound, junction 2 to A1 southbound junction with Rowley Lane. Lane closure for urgent bridge repairs.
  • From 10pm August 20 to 5am August 21. Moderate delays (10-30 minutes): Northbound, Rowley Lane junction to junction 1. Lane and slip road closure for drainage works. Diversion via National Highways roads.