South West - Maintenance schemes

We recognise the environmental value of trees, and manage our trees through their whole lifecycle, to control safety risk and optimise the environmental value provided by trees. 

In the South West we manage a large estate including significant areas of woodland by the side of our roads. Our tree specialists carry out regular inspections for safety and general woodland management. 

We also have a legal obligation to ensure our strategic road network remains safe to road users and the trees in our care do not pose a hazard to adjacent property. Where possible we will make trees safe, and as a last resort remove dead or dying trees when advised to do so by our specialists. 

Ash dieback is significant across the South West region, it has spread rapidly to the trees alongside our roads over recent years. 

Regrettably, surveys by our specialists have found dry conditions and increased temperatures have increased stress on already diseased trees and many ash trees are deteriorating quickly. A large proportion are now dead or dying and pose a potential safety risk, leaving us with no alternative other than to make them safe or remove them. 

Over the coming months, we will remove or make safe ash trees identified for urgent action. We will also be replanting trees in some locations. 

We will be removing and replanting in the following locations: 

• The A30 between Whitecross, Cornwall, and Shillingford Abbot, Devon. 
• The A38 between Tamar Bridge and Exeter. 

The tree work along the A30 will start on Tuesday 22 April and will last approximately 6 weeks. 

The tree work along the A38 will be carried out in two phases: 

• Phase one (Tamar Bridge to Lee Mill) will start on Monday 19 May and will last approximately 7 weeks. 
• Phase two (Lee Mill to Exeter) will start on Monday 3 November and will last approximately 5 months. 

The work will take place overnight. 

Traffic management will include a combination of lanes closures and complete carriageway closures depending on the work taking place. If needed, diversion routes will be fully signposted. 

Ash dieback is a national issue and more information from the Forestry Commission can be found. 

Also, please refer to the Tree Council - Ash dieback a tree owners guide 

Work

We’re resurfacing the A30 in both directions from east of Loggans Moor Roundabout through to Tolvaddon junction. 

This will maintain and improve safety for everyone using the road and reduce the need for any unplanned closures. 

Closures and diversions

We’ll be working weeknights (Monday – Friday between 8pm and 6am) when there is less traffic on the road. 

During the day and at weekends, including over the August Bank Holiday weekend, the road will be open as usual.

Our works will be carried out in two phases: 

Phase 1 – Loggans Moor Roundabout to Treswithian

Eastbound:

• Monday 28 July 2025 to Tuesday 12 August 
• Monday 1 to Wednesday 3 September 

Diversion

Traffic will be diverted along Carwin Rise through to Roseworthy Hill and rejoin the A30 at Treswithian

Westbound - Treswithian to Loggans Moor roundabout:

• Monday 11 August to Wednesday 27 August
• 1 night Thursday 16 October 2025

Diversion

• Traffic will follow the opposite diversion as eastbound 

Phase 2 – Treswithian – Tolvaddon - Avers

Eastbound:

• Thursday 4 to Monday 15 September 

Diversion

• Traffic will be diverted to the A3047 Treswithian Road and rejoin at Tolvaddon

Eastbound:

• Friday 17 to Wednesday 24 September
• Tuesday 21 October (1 night)

Diversion

• Traffic will be diverted along A3047 from Tolvaddon to Avers

Westbound:

• Thursday 25 September to Friday 17 October 

Diversion

• Traffic will follow the opposite diversion as eastbound from Tolvaddon to Treswithian 

Well signed diversions will be in place. 

Dates may change at short notice due to poor weather conditions or operational reasons. If we’re unable to complete our work as planned, we may need to continue beyond the dates stated above. 

Please plan ahead and allow extra time for your journeys. 

Access will be maintained to properties within the closure area. 

Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England. Our travel alerts give details of live incidents on our network.

We’re resurfacing the A30 (eastbound) from Temple Junction through to Colliford. 

We’ll be carrying out this work weeknights (Monday – Friday between 8pm – 6am). This is when there is the least amount of traffic using the road. 

While we’re working, we’ll be using a convoy system on the eastbound A30. This means the A30 is still open, but you will be taken past the working area behind a traffic vehicle at a reduced speed. 

Works will start on Monday 23 June. It will take up to six weeks to complete our works. 

The road will be open as usual during the day and at weekends. 

Closures and diversions

The central reservation gaps on the A30 at Shallowater and Colliford Lake will be closed for a small number of shifts when we’re working in those areas. 

When the central reservation gaps are closed, there will be short, well signed diversions in place: 

• for westbound traffic wanting to join the A30 eastbound, a short diversion will be in place via Temple Tor junction
• for eastbound traffic wishing to join the A30 westbound, a short diversion will be in place via the Jamaica Inn junction

Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England site. Our travel alerts give details of live incidents on our network.

We're renewing road markings and replacing road studs along stretches of the A303 between Devon and Wiltshire to improve visibility and safety for drivers. 

The work will be carried out in phases under overnight closures to keep disruption to a minimum. 

Closures and Diversions

Wednesday 20 to Friday 22 August and Tuesday 26 to Wednesday 27 August - A303 between Eagle Tavern and A30 Junction near Newcott

Overnight (8pm-6am) carriageway closures

We'll work on on week nights only. We won't work on bank holiday Monday.

Westbound diversion

Take the A358 southbound, then the Old A30 westbound to rejoin A303/A30 junction at Upottery.

Eastbound diversion is the same route in the opposite direction.

27 August to 30 August - A303 between Honiton and the A30 junction

Full overnight (8pm-6am) carriageway closures.

Westbound diversion

Take the Old A30, then the A358 and A35 to Honiton and join A30.

Alternatively, go by Stockland Hill and the A35 to Honiton, then join A30.

Eastbound diversion is the same route in the opposite direction.

Sunday 1 to Friday 5 September - A303 between Sparkford and Wincanton 

Overnight (8pm-6am) carriageway closure.

Diversion by A359 and A371 

Sunday 8 September (8pm-6am) - A303 between Deptford and Longbarrow

Overnight (8pm - 6am) carriageway closure. 

Diversion route by B390 and and A360 

We'll maintain access to Winterbourne Stoke at Longbarrow Roundabout and by B3083 

Additional dates and locations may be added to the programme and we'll update this page if necessary.

Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England. Our travel alerts give details of live incidents on our network.

We’ll work weeknights (Monday – Friday between 8pm and 6am) when there is less traffic on the road. 

The road will be open as usual during the day and at weekends, including over the August Bank Holiday weekend.

Well signed diversions will be in place.

We'll work in 3 Phases:

Phase one

30 June to 2 July and 9  to 10 July

A38 westbound carriageway closed between the Smithaleigh westbound exit and entry slips

Diversion

A short diversion will be in place using the off and on slips.

3 and 4 July

A38 Smithaleigh westbound entry slip closed. 

Diversion

Take the local road network and re-join the westbound A38 at Lee Mill.  

Important - HGVs

If HGVs  leave the A38 westbound exit slip at Smithaleigh after 8pm, they won't be able to re-enter the A38 until 6am

3 to 8 July

Voss Farm eastbound exit and entry slips closed. 

Diversion

• leave via A38 westbound Deep Lane exit slip
• turn right onto B3416, then up to the roundabout and return
• turn left into local road network.  

Convoy system during slip road closures

We’ll use a convoy system on the A38. You'll be taken past the working area at reduced speed behind one of our vehicles.

Phase two

9 to 21 July

 A38 closed westbound between Wrangaton and Ivybridge. 

Diversion

Take the B3213, Marjorie Kelly Way, Western Road and the B3213 before re-joining the A38

Phase three

28 July to 16 August and 28 August to 29 August

A38 westbound carriageway closed between A38 Deep Lane westbound exit slip and A38.

Marsh Mills will be closed weeknights. 

Diversion

• take A38 Deep Lane westbound exit slip
• turn right up to the roundabout
• turn left onto B3416 (Plympton), then Glen Road and Plymouth Road
• rejoin the A38 westbound at Marsh Mills. 

18 to 23 July and 27 to 28 August

A38 westbound entry slip at Smithaleigh closed weeknights. 

Diversion

Take the local road network to rejoin the westbound A38 at Lee Mill. 

Important - HGVs

If HGVs  leave the A38 westbound exit slip at Smithaleigh after 8pm, they won't be able to re-enter the A38 until 6am

18 to 24 July and 27 to 28 August

A38 Voss Farm exit and entry slips closed weeknights. 

Diversions

Westbound Voss Farm exit slip closures:

• you'll be diverted by A38 westbound Deep Lane exit slip
• turn right onto B3416, then up to the roundabout
• return and turn left into local road network. 

Westbound Voss Farm entry slip closures:

• you'll be diverted by the local network to turn left onto the B3416
• turn left onto the A38 westbound Deep Lane entry slip.

24 to 25 July and 20 to 21 August

A38 Voss Farm entry slip (only) closed weeknights.

Diversions

• you'll be diverted by the local network to join the B3416
• turn left and then right to join the A38 eastbound by the eastbound entry slip at Deep Lane
• leave by A38 Lee Mill eastbound exit slip
• rejoin the A38 westbound by the westbound Lee Mill entry slip

25 - 26 July

A38 Voss Farm entry slip (only)  closed overnight. 

Diversion

• you'll be diverted by the local network to turn left onto the B341
• turn left onto the A38 westbound Deep Lane entry slip.  

23 to 25 July and 19 to  27 August

A38 Deep Lane westbound exit slip closed weeknights. 

Diversion

• take the A38 Marsh Mills exit slip
• use the roundabout to return by eastbound A38 Marsh Mills entry slip
• leave by the eastbound A38 Deep Lane exit slip 

24 - 25 July and 20 - 27 August

A38 Deep Lane westbound entry slip closed weeknights. 

Diversion

• take the A38 eastbound Deep Lane entry slip
• leave by the eastbound A38 Lee Mill exit slip
• take the westbound Lee Mill entry slip to re-join the A38 westbound

18 to 20 August and 27 to 28 August

A38 Deep Lane eastbound entry slip closed weeknights. 

Diversion

• take the A38 westbound Deep Lane entry slip
• leave by the westbound A38 Marsh Mills exit slip
• use the roundabout and re-join the A38 eastbound carriageway by the eastbound Marsh Mills entry slip. 

19 August (8pm to 6am) 

A38 westbound carriageway between the A38 Ivybridge westbound exit Slip and A38 westbound Entry Slip.

Diversion

• leave A38 at Ivybridge westbound Exit Slip
• turn right onto Ermington Road
• turn left onto the B3213
• rejoin the A38 westbound via Ivybridge westbound entry slip

Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England site. Our travel alerts give details of live incidents on our network.

Bloor Homes and Montel Civil Engineering are developing land at Stoketon Cross for new housing.

This includes:

• a new access roundabout onto the A38
• two new access junctions.

Bloor Homes and Montel Civil Engineering will need traffic management at various locations while they work.

For more information, visit Montel Civil Engineering.

We'll work overnight (8pm - 6am) weeknights only.

A convoy system will guide traffic through our works.

Kilna Lane and Tredinnick Lane junctions will be closed during overnight work 

We'll maintain access to businesses and properties throughout.

The road will be open as normal during the day and at weekends. 

Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England site. Our travel alerts give details of live incidents on our network.

We'll work overnight (8pm to 6am) using lane and carriageway closures.

We'll use a convoy system on the A38:

• the A38 will stay open
• you'll be taken through our works at reduced speed behind one of our vehicles

Closures

1 to 7 September - A38 westbound entry slip road at St Budeaux

Closed overnight (8pm to 6am).

Diversion

• take the B3413 to join the A38 eastbound at Smithaleigh
• then leave at Manadon to rejoin the A38 westbound

7 and 13 September and 22 to 25 September - 24/7 30mph speed limit on A38

Reduced speed limit while we remove and replacing central reserve barrier (lower when convoy working is in place). 

15 to 22 September - No overnight access to or from Pemros Road for buses and taxis

We'll clearly sign alternative routes and maintain access for shift workers at the Tamar Bridge Offices. 

Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England site. Our travel alerts give details of live incidents on our network.

We're resurfacing the A38 in Glynn Valley to improve road quality and safety for drivers. 

We'll carry out overnight closures (8:30pm-6am) to minimise disruption.

The road will be open as normal during the day and at weekends. 

Resident access 

Access for residents will be maintained at all times during the works. 

How to access your property: 

Local residents need to show a copy of the letter they have received in the post to our gatemen for access through the works. 

Key access routes: 

Turfdown to Bodmin Parkway station: 

• use Turfdown roundabout 

Mount junction: 

• access by North Lane or St Neot junction by Halfway House pub 

St Neot (Carnglaze Caverns) and Trago Mills employees: 

• use Doublebois crossroads 

Properties between Trago Mills and Lower Lodge: 

• by Doublebois crossroads (escorted through works) 

Springfield House: 

• access from A390 by North Lane (escorted through works) 

Dobwalls and Doublebois: 

• by Doublebois crossroads 

Halfway House pub: 

• by A390 and North Lane (signage in place) 

Special arrangements 8-12 September

Properties between North Lane and Drift Lane:

• access via A390 and North Lane 

Bellasize access:

• by North Lane (escorted through works) 

White Lodge Crossroads below Trewithen Dairy will be closed so residents should use Turfdown Road and Fletchersbridge 

Bodmin Parkway Station access 

We'll maintain station access throughout the works by Turfdown Roundabout. 

Traffic diversions 

light vehicles (eastbound and westbound) and westbound HGVs: 

• diverted by Lostwithiel 

eastbound HGVs over 20 tonnes: 

• diverted by A30 to Launceston
• then A390 to re-join A38 at Carkeel roundabout 

Diversion map

We'll aim to work to the programme but may need additional shifts in early October if required.

We'll keep you informed through advance road signs and update this page accordingly. 

If you have any queries or comments about the work, or would like further information please contact National Highways Customer Contact Centre on 0300 123 5000 or by email: info@nationalhighways.co.uk     

Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England. Our travel alerts give details of live incidents on our network.

You'll find more information ion this scheme on our page Safety schemes in the South West region.

Somerset Council is refurbishing junction 26 of the M5 and the A38 Chelston link road near Wellington. The scheme will replace the old concrete road and motorway junction.

Junction 26 and the A38 link road will be closed for approximately 14 weeks. 

Works are due to start on 16 June until mid / late September. 

For more information about the scheme, please visit Somerset Council’s website.

We’re renewing and maintaining roadside safety barriers across the South West. 

Traffic management

We'll work weeknights only (Monday to Friday). We won't work during the day, over weekends, or during bank holiday weekends.

We'll use a mixture of:

• overnight (8pm to 6am) lane closures
• temporary traffic lights
• convoy systems - you'll be escorted through works behind a one of our vehicles at reduced speed.

If we need diversions, they'll be fully signposted. 

We’ll be working at 114 locations across the region. Works started on 31 March and will last approximately 20 weeks. 

We'll be working overnight at these locations:

Wiltshire - early to mid April, late May to mid June

M4 both directions
A36 southbound
A303 both directions

Gloucestershire - early April, early to mid-May, late June

M4 westbound
M5 both directions
A40 both directions 

Devon - mid to late April, late May, mid July to mid-August

M5 both directions
A38 both directions 

Somerset - late April to early May, mid-May to early June

M5 both directions
A303 eastbound 

Cornwall - late June to mid July, mid-August

A30 both directions
A38 both directions

Access to local properties

If you live close to where we're working, we'll contact you before we start. We'll maintain access for you throughout our works.

Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England site. Our travel alerts give details of live incidents on our network.