New traffic control system at Saltash Tunnel goes live next week
The upgrade involved extensive excavation work, new gantry signage, fittings installation, and laying 31 miles of cabling
The Saltash Tunnel on the A38 is set for a significant upgrade with a new traffic control system scheduled to go live on Tuesday, 19th May.
National Highways began the refurbishment in early 2025 to modernise the 38-year-old tunnel, significantly improving traffic flow, safety, and air quality.
The upgrade involved extensive excavation work, new gantry signage, fittings installation, and laying 31 miles of cabling.
The Saltash Tunnel is noted as the only tunnel in Europe using a tidal flow system, allowing the three-lane structure to switch traffic directions to manage congestion between Devon and Cornwall during peak times.
After comprehensive testing, the bi-directional management system will resume operation prior to the morning rush hour on 19th May and ahead of the expected summer traffic increase.
Julian Mitchell, Tunnel Manager at National Highways, emphasised the necessity of the upgrade: “Our systems have been operating for 20-plus years so it’s essential that we make the tunnel fit for now and for the future."
“The tunnel and the tidal flow corridor – operating in tandem with the Tamar Bridge control room – rely on specialised technology and we’re now nearing the completion of this generational upgrade, one which has presented a significant challenge and involved a complex operation.
“We’ve done all we can to minimise disruption for local communities, and users of the tunnel and Tamar Bridge, we’ve been keeping all stakeholders informed every step of the way, and we thank people for their continued patience as we continue towards completion of the scheme."
Speed limits will return to 50mph from the Carkeel roundabout after the switch-on, while 30mph limits will remain through the tunnel.
Key improvements from the upgrade include new LED lighting, better traffic management systems, advanced cabling and communication systems, and enhanced air quality monitoring.
The refurbishment is nearing completion, with finishing touches like signage and resurfacing expected later this year.
Mr Mitchell acknowledged the inconvenience caused during the refurbishment, thanking locals and drivers for their cooperation and patience.
He said: “We appreciate the scheme has had some impact on road users and Saltash residents, and we have worked closely with our Tamar Crossings partners/the Tamar Crossings team to minimise disruption.
“Once fully completed, the upgrade will reduce the number of maintenance closures, and in the meantime we thank all drivers and residents for their continued co-operation and patience.”