Update on Saltash Tunnel
National Highways has released an update on the works on the Saltash Tunnel."Tidal flow switch on date announced – 6 am Tuesday 19 May
We’ll be switching on the new tidal flow lane control system on Tuesday, 19 May at 6 am.
Once live, we will be able to change the direction of traffic by the overhead signals.
Until then, please continue to stay in lane.
What you can expect to see over the coming days
During our overnight tunnel closures, we'll be preparing to turn on the new system. This includes:
- removing the temporary traffic management that’s been in place, such as signage
- repainting the linings on the road
From 6 am on 19 May, the speed limit from Carkeel roundabout down to the tunnel will return to the permanent 50mph limit. New signage will be in place to reflect this.
What’s next?
We still have a lot of work to do in and around the tunnel for the next few months.
This includes continuing technology upgrades in the tunnel, such as:
- new signage
- dynamic lighting upgrades
- power installations
- fibre optic installations
- installing the new electronic variable messaging signs at Carkeel, near the Tamar Bridge and at Manadon
- resurfacing the tunnel
Overnight tunnel closures (Monday – Thursday) will remain until later in the summer.
The scheme will be fully completed later this year."
16th May 2026