A series of overnight closures of the tunnel will begin on weeknights from Monday.
The speed limit on the approach to the Saltash tunnel will be reduced by 20mph as part of aA series of overnight closures have been announced for the work, starting on weeknights from Monday 18 September.
The 35-year-old tunnel will have its tunnel and traffic control system refurbished along with the electrical distribution, lighting, fans and electronic signage.Image source,Julian Mitchell, National Highways' tunnel manager, said: "This section of the A38 sees a number of minor collisions as motorists try to reduce speed quickly on the approach to the tunnel and the Carkeel roundabout.
He added: "The tunnel is safe but it is essential that we replace our systems which have been operating for more than 20 years."We'll be preparing the site by stripping out the outdated and redundant equipment and cleaning and preparing cable routes for the kilometres of cabling that will need to be installed."
He apologised for any inconvenience and advised drivers to plan ahead and allow "a little extra time for their overnight journeys".The tunnel will be closed on weeknights, from 20:00 to 06:00 , between Monday 18 September and Friday 7 October, with traffic diverted via the B3271 and North Road.
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