We want to make improvements between the Penblewin roundabout and Redstone Cross on the A40, Pembrokeshire.

First published:
26 July 2019
Last updated:


Project status: planned
Region: south west Wales
Start date: summer 2021
End date: late 2022
Cost: £21m
Designers: Arup with Environmental Design provided by RML

Why we are doing it

The A40 between St Clears and Haverfordwest is mainly a single carriageway.

We identified in the A40 West of St Clears study that there was a need for this scheme. We revisited and updated the study in 2015 to confirm that we should go ahead with this project.

In August 2018, the Cabinet Secretary for Economy and Transport, Ken Skates AM, confirmed in writing to the Senior Coroner in response to the inquest into the death of a driver joining the A40 at Redstone Cross, that investigations have begun to develop further overtaking opportunities & safety improvements along the length of the A40, which includes improvements at Redstone Cross.

The identified problems are:

  • the A40 mainline and Redstone Cross Junction is substandard
  • limited overtaking opportunities lead to poor journey time reliability and driver frustration
  • occasional convoys of heavy goods vehicles from the ferry ports and slow-moving agricultural vehicles contribute to periods of platooning and journey time unreliability, which is exacerbated with limited overtaking opportunities
  • seasonal spikes in traffic volumes along the A40 especially during the summer months leads to slow moving traffic causing journey time unreliability, which is exacerbated with limited overtaking opportunities
  • there are many side road junctions and direct accesses to properties and agricultural fields off the A40, which contributes to operational problems along the road
  • a mix of traffic types using the road, contributing to journey time unreliability and driver frustration, risky manoeuvres and collision incidents
  • a lack of strategic public transport connectivity in Pembrokeshire generally means there is a dependence on the private car for inter-urban connections.

Current progress

A Welsh Transport Appraisal Guidance (WelTAG) combined Stage 1 and 2 study is currently being undertaken. The Scheme problems and objectives have been determined and solutions have been identified, reviewed and are being appraised. The problems and objectives are compatible with those from the A40 Llanddewi Velfrey to Penblewin Improvements, which have been agreed with the Review Group. WelTAG embeds the Well-being of Future Generations (Wales) Act 2015 and considers economic, environmental, social and cultural impacts.

As part of the ongoing WelTAG Study, an appraisal of the options is being undertaken. This includes an appraisal of the route options against the: Scheme objectives, and social, cultural, environmental and economic considerations. The appraisals are undertaken against the Do Minimum Scenario, which reflects the existing situation with limited intervention and includes any future development identified within the Local Development Plan (LDP). The appraisal also considers how each option performs in solving the identified problems.


Publish preferred route: autumn 2019
Publish Draft Orders: early 2020
Statutory process: early 2020 to early 2021
Potential Public Inquiry (if required): summer 2020
Welsh Ministers’ decision to make the Orders: early 2021 
Construction starts: summer 2021
Construction ends: late 2022

Next steps

Following completion of the public consultation and the appraisal of the options, a preferred route will be announced.
Following this, Arup will complete the outline design and detailed Environmental Impact Assessment. This will help us to identify the land required to build the scheme. We would then proceed through the statutory process and seek the powers to build the road.

The draft orders for this scheme will be available in early 2020. A draft Orders exhibition will take place in the local community around the same time. Draft Orders give you the option to object, support or suggest alternatives.

As part of the legal process we will consider all the responses. We can then decide whether to hold a public local inquiry.

How we are consulting

We are undertaking a public consultation which will run between 26 July 2019 and 20 September 2019.

We have held two series of public information exhibitions for A40 Penblewin to Redstone Cross Improvements. On 10 and 11 April in Llanddewi Velfrey Village Hall and 30 May at Bloomfield House, Narberth. Attendees were invited to complete feedback questionnaires at each exhibition.

Arup have appointed a dedicated Public Liaison Officer for the scheme.

Find out more

If you have any concerns or queries you can contact Martin Gallimore, Arup’s Public Liaison Officer, directly on 07923 887119 or alternatively email: A40enquiries@arup.com