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M4 junction 18a link road study

Consultation on route concepts

The Joint Transport Study for the West of England has identified a range of improvements to the transport networks in the region, including the need for a new motorway junction between M4 Junction 18 and Junction 19 (Junction ‘18a’), and an associated link road to the A4174 Ring Road. The scheme would help tackle congestion problems in the north-east fringe of Bristol and help businesses operate more efficiently.

The Department for Transport granted funding for a feasibility study into the M4 Junction 18a Link. South Gloucestershire Council, in partnership with Highways England (responsible for the motorways), commissioned consultant CH2M to undertake this study.

We consulted on potential concepts for the location of the new junction and link road, plus directly associated improvements to the existing transport networks, from 21 August to 16 October 2017.  The consultation is now closed but the consultation material is still available to view for reference at

This is the first stage in scheme development. If the scheme progresses, it would require detailed design, evaluation, preparation of business cases and statutory permissions.  There would also be further rounds of public consultation as the scheme is developed over forthcoming years.

South Gloucestershire Council’s Cabinet considered the outcome of the M4J18a study at their next meeting on 12 March 2018.  The report considered by Councillors at the meeting is available to view (under item 9).  The report recommends to the Cabinet members that they support the Western Option (option 1) as the preferred location for the new junction and link and this was agreed at the meeting.

View the draft Strategic Outline Business Case (SOBC) (also known as the feasibility study) documentation.


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