Hindhead Tunnel

Latest updates

• 11 June 2026

  Summer 2026 maintenance

  We're maintaining the A3 in and around the Hindhead Tunnel this summer and autumn. 

  This work will keep the road and tunnel safe, improve surface conditions and extend the life of the road.

  The Hindhead Tunnel hasn't been resurfaced since 2011, so this is an important programme of investment. 

  What we're doing 

  On the A3 between Thursley and Hindhead, we'll be:

  • resurfacing the road
  • sealing joints
  • renewing road markings and high friction surfacing
  • and repairing defects including cracks and potholes

  In the Hindhead Tunnel, we'll be:

  • replacing defective LED road studs 
  • installing a new intelligent lighting system
  • planing and resurfacing the tunnel road surface
  • and renewing road markings

  Most of the work will happen overnight, when traffic levels are lower. The noisiest work will finish before 11pm to keep disruption to local residents to a minimum. 

  Closures and diversions

  Hindhead Tunnel 

  The southbound side of the tunnel will close, with a contraflow running one lane in each direction through the northbound tunnel: 

  • Full weekend: 9pm Friday 26 June to 6am Sunday 29 June
  • Overnights: (9pm to 6am): 29 June to 11 July, and 20 to 24 July 

  Further overnight closures for routine maintenance activity will take place between 13 and 17 July. 

  A3 overnight closures (9pm to 6am) 

  • A3 closed northbound between the Longmoor junction and Hog's Back: 1 to 27 September
  • A3 closed southbound between Hog's Back and the Longmoor junction: 9 October to 8 November 

  Diversion routes 

  When the A3 is closed, diversions will add approximately 10 miles to your journey. 

  Northbound diversion 

  • Leave the A3 at Longmoor and join the A325 north towards Sleaford
  • continue on the A325 towards Alton
  • at the junction with the B3004, turn left towards Alton
  • in Alton, join the A31 towards Farnham and Guildford
  • and continue past Farnham to rejoin the A3 at Hog's Back 

  Southbound diversion 

  • Leave the A3 at Hog's Back and join the A31 towards Farnham and Alton
  • stay on the A31 past Farnham towards Alton
  • at the roundabout in Alton, follow signs for the B3004 towards Sleaford
  • continue on the B3004 and at the junction with the A325
  • turn right towards Petersfield
  • continue on the A325 to rejoin the A3 at Longmoor

  Access 

  If you need to reach properties at Warren Park during the works, you will be escorted through the site. Emergency services will have access at all times. 

  Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England. Our travel alerts give details of live incidents on our network.

• 20 March 2025

  Overnight closures - March and April

  We need to close the tunnel overnight for essential maintenance.

  We'll close the A3 southbound between A31 Hogs Back junction to Hazel Grove junction overnight (9pm to 6am):

  • from 9pm Tuesday 25 March to 6am Saturday 29 March
  • from 9pm Monday 31 March to 6am Saturday 5 April

  We'll also close Longmoor junction and Hazelgrove junction northbound.

  There will be local access only southbound:

  • between Hogs Back and Milford, week commencing Monday 24 March
  • between A31 Hogs Back and Bowlhead Green, Thursley, week commencing Monday 31 March

  Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England. Our travel alerts give details of live incidents on our network.

• 12 March 2025

  Essential maintenance

  We need to close the tunnel in both directions for essential maintenance over seven nights.

  The A3 will be closed southbound from A31 Hogs Back and Bowlhead Green Thursley.

  Longmoor junction and Hazelgrove junction will also be closed northbound.

  The overnight closures will be 10pm to 6am each night during:

  • Tuesday 25 March to 6am Saturday 29 March
  • Monday 31 March to 6am Wednesday 2 April
  • Thursday 3 April to 6am Friday 4 April

  Diversions:

  From A3 northbound, on the Thursley to Compton road, use the B3000 Puttenham Heath Road to the A31.

  From the A31, heading southwest, south of Guildford

  • A31 to Chawton,
  • A32 south to West Meon Hut,
  • A272 east to A3 at Petersfield 

  Please use this route in reverse order for the A31 northbound diversion.

• 15 January 2025

  Northbound closures - 16 to 24 January

  We will close the tunnel northbound from 16 to 24 January between Hindhead and Thursley.

  This is part of a series of weeknight A3 closures.

  A long diversion route onto the A31 will be in place.

• 01 November 2024

  Temporary speed limit - new date for repair

  The speed limit through the northbound side of the tunnel will remain in place now until mid-December. We will be doing the necessary repairs to resolve the fault and lift the temporary speed limit during night time closures (9pm-5am) of the tunnel on 16, 17, 18 and 19 December. The normal diversion route will be in place via A325 and A31 as usual.

  November’s monthly routine maintenance will still be carried out during the week commencing 18 November. The tunnel will not be closed for this but will operate in contraflow during this work.

• 15 January 2024

  Weeknight closures for lighting upgrades - November 2023 - March 2024

  We’re working to replace some of the lighting in both bores of the Hindhead Tunnel to improve safety and visibility. Work is due to start on weeknights from Wednesday 15 November till March 2024. We’ll only need to close one entrance to the tunnel at a time and use a contraflow system, so you’ll still be able to travel through. We apologise for any inconvenience caused during our safety upgrades.

  Please remember that closure details can change at short notice.  For the most up-to-date information, please visit our daily closures page.