Why M4 junction closure options have raised emergency-response concerns

Gwent Police and Crime Commissioner Jane Mudd has asked the Welsh Government to consult emergency services over possible M4 junction closures, warning that longer routes and traffic displaced onto local roads could delay responses. Her statement, issued on 8 October, concerns options being examined rather than an agreed closure programme. The government announced an 18-month study on 6 October, after which a preferred road-based solution would be selected.

What the closure option would change

Arup’s review describes full closure of junction 27 at High Cross and closure of the east-facing slip roads at junction 26, Malpas, and junction 25, Caerleon. The aim is to reduce joining, leaving and weaving traffic. The indicative £14m capital cost and potential traffic reduction of up to 3% on limited M4 sections are estimates, not an approved budget or a measured improvement.

Motorway flow and local access pull in different directions

Arup warns that displaced traffic would pressure roads around Malpas, High Cross and Ridgeway, including junction 28. Local access would fall without a material increase in motorway capacity. The review uses existing studies and professional judgement, with no new transport modelling. Mudd’s concern about potential emergency delays is not evidence of an already delayed journey.

What happens alongside the study

The government has also set out a five-year programme of shorter-term work: maintenance, motorway management, targeted road and junction improvements, freight measures and public transport links. That programme and the 18-month study have different purposes. The study is intended to choose a longer-term option; the five-year programme covers nearer-term measures. Neither announcement sets a date for these junction closures.