A303 Sparkford to IlchesterRecently updated

Improving the single lane to a dual carriageway on the A303 between Sparkford and Ilchester, part of a programme of improvements to the A303/A30/A358.

Region:  South West
Start date:  TBC
Cost:  £100 to £250 million
Status:  PLANNED
Type:  Major Scheme
End date:  TBC

What impact will this have on my journey?

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Progress report

We held a public consultation on our proposed options from 15 February to 28 March 2017. This was to provide you with the opportunity to give your views on our proposals. You can still visit the consultation page to read the consultation documents.

We are now carrying out habitat surveys, gathering evidence of any potential protected species residing within the area. Ecologists will be conducting a range of surveys, both day and night.

During the work you may see you may see members of the ecological team studying trees, hedges, barns and ponds for protected wildlife. The land we survey will not necessarily be impacted by the construction of the final scheme.

What next?

We will combine your feedback from the consultation with further technical analysis and use this to decide our “preferred route”, the option we will take forward for more detailed design. We hope to be able to announce the preferred route in autumn 2017.

If all goes to plan we would like to start on site in 2020.


Date Event
December 2014 Scheme announced
February 2016 Public information events
15 February to 29 March 2017 Have your say

Why we need this scheme

The A303/A358 corridor is a vital connection between the south west, London and the south east. While much of the route is a dual carriageway, there are still over 35 miles of single carriageway. These sections act as congestion bottlenecks, particularly in the summer months and at weekends, causing delays to road users travelling between the M3 motorway and the south west and an increased risk of accidents.

This section of the A303 between Sparkford and Ilchester comprises a mix of dual and single lane carriageway, which leads to localised congestion, impacting adversely on journey times and reliability. This section also has a poor accident record as a result of poor junction alignment and visibility, and changes in road type.

We are proposing to dual this single carriageway section. The scheme will reduce congestion, improve journey times and make our network safer for customers.


The scheme will:
  • reduce congestion, improve journey times and make our network safer for our customers
  • support jobs and economic growth at a local and national level
  • minimise adverse impacts on the surrounding natural environment and landscape

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Project documents
A303/A358 autumn 2016 newsletter |

Project timeline

Planned roadworks

Roadworks and Events for England

The latest incident information for England's motorway and trunk routes provided by Highways England

Location : The A303 westbound between the junctions with the A372 and the A37 . Lane Closures : Lane two will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 30 May 2017 to 3 June 2017. Lanes Closed : There will be one of two lanes closed.
Posted: May 27, 2017, 12:22 am


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The A47 is closed westbound between the A1122 and A10/A149, due to an overturned HGV.
Posted: January 1, 1970, 12:00 am

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