A358 Taunton to Southfields

We’re proposing to upgrade the A358 to dual carriageway between Southfields Roundabout on the A303 and the M5 at Taunton. The delivery of this scheme is part of a long term aim to create a high-quality dual carriage way link between London and the South East and the South West.

Start date TBC

End date TBC

Cost £250 to £500 million

The A358 in Somerset connects the M5 at Taunton with Southfields roundabout on the A303

Congestion along the A358 in Somerset

The A358 in Somerset connects the M5 at Taunton with Southfields roundabout on the A303
Congestion along the A358 in Somerset
Congestion along the A358 in Somerset
Congestion along the A358 in Somerset

Latest updates

24 October 2019

Surveys

We’re carrying on with our surveys that will help inform our future scheme design. We’d like to thank everyone who has been affected by our surveys for their patience and understanding, it’s really appreciated.

We’re also carrying out a procurement exercise to appoint a new designer to take the scheme forward through the statutory phase and into construction. It’s anticipated we’ll finish this exercise in 2020. We’ll hold the next Community Liaison Forum once the new designer is on board.
24 October 2019
Preferred route announcement

Since we announced our preferred route in June, we’ve been carrying out surveys to help inform the scheme design ahead of consultation. In September we held our second Community Liaison Forum and asked the members of the forum to give feedback on the route to help us develop the scheme design. We’ve grouped the feedback given under four headings:
- local links and community severance
- process, timeline and scope of works
- rationale and impact of the route regarding housing development and economic growth with a focus on job creation
- focus on the location and performance of proposed and existing junctions and access points
You can see more detail about the feedback in the meeting note in the 'Consultations' folder under the project information section.

We’ve also been busy creating an animation to explain the process we go through when designing a road scheme such as the A358. We hope this will help you understand the level of detail you can expect to see at each stage.

See more updates

Project information

The A303/A358 corridor is a vital connection between the South West and London and the South East. While much of the corridor 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, and they add to an increased risk of accidents.

Currently most of the A358 is a single lane and has many local roads and private accesses joining directly with it. It’s often congested and is a source of frustration for local people, and those using the road to travel longer distances.

Many road users try to avoid the traffic congestion by diverting onto smaller local roads, which then increases the level of traffic in surrounding villages.

To address this, we’re proposing to upgrade a nine-mile section of the A358 between Southfields Roundabout on the A303 and the M5 at Taunton, to a high quality dual carriageway.

In 2019 we made our preferred route announcement for the improvement scheme, confirming that we’ll be taking a modified version of the pink option forward. You can find out more about the options consultations and the chosen route.

In delivering the scheme, we’re aiming to:

improve the capacity of the road to reduce delays and queues that occur during peak hours and at key times of the year i.e. the height of summer.
support economic growth, facilitating growth in jobs and housing by providing a free-flowing and reliable connection between the South East and the South West
make the road safer, by providing additional capacity and reducing driver stress. We’ll also improve routes for pedestrians, cyclists, horse riders in the area.
protect the environment and look for opportunities to improve it, minimising any unnecessary impact of the scheme on the surrounding natural and historic environment and landscape
work with local communities to reduce the impact of the road in terms of community severance, and look for ways to improve local peoples’ quality of life
make journey times more reliable and resilient; by providing more capacity it will become easier to manage traffic when incidents occur