Overnight A40 closure at Dixton Roundabout, Monmouth for three weeks

Drivers using the A40 at Dixton Roundabout, Monmouthshire should expect overnight closures for road works starting 28 August 2025.

The Welsh Government has issued an order under the Road Traffic Regulation Act 1984 to carry out essential works on or near the roundabout.

What drivers need to know

• All vehicles are prohibited from using the circulatory carriageway of Dixton Roundabout overnight, except emergency services or vehicles involved in the works.
  
• Hours of closure: 8:00pm to 6:00am, for three weeks.
  
• The order will remain valid for up to 18 months as a contingency in case the works need to be rescheduled.

Diversion routes

Non-HGV traffic

• Eastbound: southbound A449 from Raglan Interchange → M4 Junction 24 (Coldra) → eastbound M4 to Junction 23 (Rogiet) → eastbound M48 to Junction 2 (Newhouse) → northbound A466 to Highbeech Roundabout, Chepstow → north-eastbound A48 to Highnam → westbound A40 to Ross-on-Wye → south-westbound A40 to Monmouth or continue north-eastbound.
  
• Westbound: follow the same route in reverse.

Non-motorway traffic

• Eastbound: southbound A449 from Raglan Interchange → M4 Junction 24 (Coldra) → eastbound A48 to Highbeech Roundabout, Chepstow → follow the remainder of the route described above.
  
• Westbound: follow the same route in reverse.

HGV traffic

• Eastbound: southbound A449 from Raglan Interchange → M4 Junction 24 (Coldra) → eastbound M4 to Junction 20 → northbound M5 to Junction 8 → southbound M50 → join A40 at Ross-on-Wye.
  
• Westbound: follow the same route in reverse.

Additional information

• The closures are temporary and overnight only, but the order allows for flexibility in case of delays or additional works.
  
• Any changes to dates or times will be announced in advance.
  
• Full order and notice can be viewed on the Welsh Government website: Road Orders.

For further details, contact: P Huish, Transport, Welsh Government.