A1(M) Hatfield Tunnel Refurbishment
The A1(M) through Hatfield Tunnel forms part of the Trans-European Road Network. The existing Hatfield Tunnel is located between Junctions 3 and 4 on the A1(M). The tunnel passes beneath Cavendish Way to the south and Green Lanes roundabout to the north and runs parallel to the A1001.
The Hatfield Tunnel is a twin bore reinforced concrete portal frame structure and was constructed in 1985. The tunnel is approximately 1,147m long between the south and the north portals.
Refurbishment is required because the tunnel's mechanical and electrical systems are at the end of their design life and to upgrade tunnel equipment in line with new standards. New monitoring equipment will be installed and linked to the new control systems in the Highways Agency’s Regional Control Centre.
Improvement for the Hatfield Tunnel Refurbishment Project will be carried out in the following major phases:
What will we be doing:
Each bore of the tunnel will be completely closed to traffic during its refurbishment. During this period the other bore will accommodate four lanes operating with a contraflow, with a reduced maximum mandatory speed limit. It may be necessary to occasionally undertake certain activities overnight, during a complete closure of the whole tunnel, with mainline traffic diverted on to the A1001.
In the spring of 1983, work started at Hatfield on the alterations to gas, electricity and water mains, sewers and telephone equipment etc.
In spring 1984 , construction work commenced.
Hatfield Tunnel Opened on the 10 December 1986 by the Duke of Kent.
The 1,147m long tunnel is a cut-and-cover structure constructed east of the existing A1 between Cavendish Way and the Green Lanes Roundabout. The tunnel accommodates the full motorway formation width with a continuous separating wall along the motorway centre line.

For more information on this project, click here to visit the Highways Agency website
A1(M) Hatfield Tunnel Refurbishment
Skanska Balfour Beatty Joint Venture
c/o Computacenter
Hatfield Business Park
Hatfield
Hertfordshire
AL10 9TW
Community Relations Manager
Melanie Thickbroom
Tel: 01707 635280
Email: communityrelationshatfield.m25@sbbjv.co.uk
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