A47 Thickthorn junction

This scheme will improve the junction between the A47 and the A11 by adding 2 new link roads to ease congestion in the area.

Start date January-March 2023
End date 2024-25
Cost TBC

Latest updates

  • 21 July 2020

    Consultation now closed

    The statutory consultation on our proposal to upgrade the A47/A11 Thickthorn junction has now closed.

    We have been reviewing and considering the feedback you've provided through the consultation. Where appropriate, we are using the feedback to make further refinements to our proposed design and development of mitigation measures.

    Whilst further design refinements may continue during our conversations with key stakeholders and as further survey results become available, we have issued a project update and a refined junction design.

    We expect to submit our application for development consent early next year (2021). The application will include a consultation report which will feature a summary of responses and will describe which suggestions we were able to incorporate. This will demonstrate how we have listened to feedback.

    Our application for development consent will be available to the public on the Planning Inspectorate’s website after its submission.

    Please watch our video for more information on the Development Consent process.

  • 13 July 2020

    Surveys taking place from Summer 2020

    We will be undertaking important surveys and archaeological trial trenching from this summer (2020). You can expect to see survey vehicles and equipment in operation close to Thickthorn junction, but please note that this is not the start of any construction work.

    The investigations will help us better understand any local archaeology and give us information on how we may need to adjust the junction layouts. The surveys are critical for ensuring that we limit any possible impacts by fully recording all archaeological sites. The results of the surveys will be reported in our Environmental Statement and are a normal part of the development consent process.

    This type of early survey work will help us to avoid any unexpected surprises and unnecessary delays once construction starts. It also means we can develop a plan for mitigation work and construction to coincide on site once the project is given the go-ahead.

Project information


The A47/A11 Thickthorn junction is important for commuter, business and commercial traffic, on both short and long-distance journeys.

Approximately 3,000 new residential dwellings are potentially planned near the junction, along with commercial business units. This local growth is likely to increase congestion on the junction and the roads that feed into it.

The project will help relieve congestion at Thickthorn junction by providing two new free-flowing slip roads that will connect the A47 with the A11. The new slip roads will re-route traffic away from the junction and flow it under new underpasses.

We’ll also remove the existing footbridge over the A47 and provide a new footbridge for walkers, cyclists and horse riders.

Revised layout

Our revised layout that we intend to submit for planning approval includes:

  • a single-lane free-flowing link road connecting the A11 northbound to A47 eastbound via two underpasses (under the A11 and A47 respectively)
    • improvements to the junction:
    • widening the existing slip road on the A47 westbound and building a dedicated left-hand free flow lane to the A11 southbound.
    • widening the southern section of the roundabout from three lanes to four
    • new traffic lights on the approach to / from the junction with the B1172 Norwich Road
    • new road surface, new road signs and road markings throughout the junction.
  • removal of the Cantley Lane South direct connections between the A11 and A47 exit slip roads
  • a new link road connecting Cantley Lane South with the B1172 Norwich Road to the north and construction of two new bridges. The new link road it will have a 40mph speed limit
  • from the Thickthorn junction to Hethersett, a 40mph speed limit on the B1172 Norwich Road and a new junction connecting to Cantley Lane Link road.
  • a 30mph speed limit on Cantley Lane South
  • a new junction connecting Cantley Lane South to Cantley Lane link road
  • the existing Cantley Lane stream and access track will be realigned and one new stream culvert constructed
  • a new footbridge over the A47 for walkers, cyclists and horse riders approximately 45m east of the existing footbridge (which will be demolished). The footbridge will have higher railings to help improve safety for horse riders
  • paths for walking and cycling proposed along the new Cantley Lane link road giving access to local amenities and links to other recreational routes
  • access to the Park and Ride from the Cantley Lane link road for walkers and cyclists

These improvements to the junction aim to:

  • improve road safety for motorists and for those living near the junction
  • reduce congestion, make journey times more reliable, and increase capacity for future traffic growth
  • Help the road cope better if there are vehicle collisions or breakdowns, and during road maintenance
  • Help support regional housing and economic growth in Norwich and the surrounding areas
  • help protect the environment by minimising adverse impacts and, where possible, deliver benefits
  • consider local communities and their access to the roads
  • provide a safer route between communities for cyclists, walkers, horse riders and other non-motorist groups

A47/A11 Thickthorn Junction Improvement Scheme - 3 June 2019 to 11 July 2019

A47/A11 Thickthorn junction improvement - 13 March 2017 to 21 April 2017

Scheme design as presented at 2019 Statutory Consultation.


Traffic information

Information about scheduled roadworks and events on our motorways and major roads.

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