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A350 and C13 route management scheme

A350 VAS

Dorset County Council is working with town and parish councils to agree a medium-term solution for the A350 and C13.

Dorset County Council has received £2,492,000 from the Governments National Productivity Investment Fund, which will be used to carry out structural maintenance and improvements along these two roads - which provide the vital north-south route into Poole.

Possible work could include:

  • carriageway resurfacing
  • speed limit review on A350 and C13
  • formalising HGV Routing via implementation of Traffic Regulation Order
  • vehicle activated signs (VAS) 
  • traffic engineering solutions
  • junction improvements
  • maintenance of existing temporary signals in Dinah's Hollow

Any work will need to be completed within the 2017/18 financial year in order to maintain this funding. We hope to be able to start work in Autumn 2017.

Latest news - 19 October

Following on from the consultation earlier this year, we're progressing work on the detailed design of the scheme. The statutory consultation on the traffic regulation orders for the changes in speed limits will be online in November.

In December, six options about the HGV routing will go before Cabinet for members to make a decision on the way forward.

Maintenance work

Our first phase of work - to carry out patching, surfacing and drainage along the two roads - will get underway in November.

C13 patching - various locations

Daytime working 9am to 4pm, 6 November to 17 November with Stop & Go, plus some convoy working.

C13 surfacing - Sunrise Business Park

Night work 7pm to 7am, 20 November 25 November with a section of road closed.

Stourpaine resurfacing & Stepleton Bends kerbing, lining and signing

Night work 7pm to 7am, 27 November to 15 December (weekdays only), with a section of road closed.

Access will be maintained for emergency services at all times. Residents will be able to access their homes but there may a short delay.

During November and December, drainage improvement work will also be carried out on the A350 at its junction with Whitecliff Mill Hill and in Stourpaine.


We have continued to work with the parish councils for the area along with the local action groups in order to achieve an improvement for all road users of the A350 and C13.

In June Dorset County Council held two exhibitions for locals to review the initial design proposals of the improvement scheme, ask questions and leave feedback. In total 164 local residents attended the two events, held in Stourpaine and Melbury Abbas, and engineers received 109 responses (pdf, 371kb) (opens in a new window), which included 41 online forms.

Proposals to introduce a 50mph speed limit between the villages along the A350 got approval from 72 per cent of respondents, 83 per cent were in favour of a 40mph speed restriction being introduced on Spreadeagle Hill south of Melbury Abbas, and 83 per cent value vehicle activated signs to assist communicating any traffic restrictions.

The responses received showed that 54 per cent are in favour of the voluntary one way system currently in place.

Consultation scheme plans

The following plans were on display at the public consultation exhibitions. As detailed design work is now underway we will soon be replacing these with up to date designs of the areas in question.

General drawings




In April 2014 Dinah's Hollow, on the C13, was closed due to the risk of a car being engulfed by a slippage of the slopes of the natural hollow.

Following extensive investigations, Dinah's Hollow was reopened in July 2015 with a reduced width and traffic lights controlling the flow of vehicles down the centre of the road, and a trial of an unofficial, voluntary HGV one-way system, while work continued on progressing a scheme designed to pin the slopes in place

In December 2015, Dorset County Council Cabinet decided to continue talks with neighbouring counties to investigate the possibility of building better transport links from Poole and Portland ports up to the M4 motorway - with the aim that by working with Wiltshire, Bath and North East Somerset councils to look at the whole route, and whether the considerable investment needed will bring economic growth and development to the region, will help to attract funding from the Government's growth deal three.

It was agreed that the traffic management for Dinah's Hollow would be upgraded to reflect the amount of time they may now need to be in place, along with a regular inspection regime to check equipment and for signs of slips.

In February 2016, the temporary water-filled barriers used in a continuous line as protection against a potential slip were replaced with permanent concrete barriers.

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