HINDHEAD Tunnel is to be closed every night from Monday, June 13, to Friday, June 17.
A spokesman for Highways England said: “There will be a full closure to carry out an upgrade to the technology in the Hindhead Tunnel.
“This is to enhance the reliability of the control system that is used to effect safe driver behaviour, if an incident occurs.
“Unfortunately, the only way to implement this improvement safely is to close the tunnel completely whilst the works are ongoing.
“Please allow an extra 45 minutes for your journey. We apologise for any inconvenience this may cause.”
During the closures, which will run each night from 9pm till approximately 6am the next day, signed diversions will be in place via the A325 and A31 for both North and Southbound traffic.
Information from the Highways England website, www.highways.gov.uk