The Welsh Government yesterday launched a consultation on new plans to tackle the notorious bottleneck at Brynglas with a major online widening scheme that would include a new tunnel on the M4, near Newport in south Wales.
The new tunnel would enabling widening the two-lane (in each direction) stretch of motorway to four lanes between junctions 24 and 29 – a distance of around 15km. Works are expected to take 15 years and cost around £550M.
The existing route has been a notorious bottleneck and leaves a key section of the M4 vulnerable to major closures. Just last year a major fire in the west bore at Brynglas closed the tunnel for three days and caused severe traffic disruption.
Consultant Arup has been heavily involved in drawing up the consultation document. Submissions are invited until 6 June and the government expects to make a decision on the appropriate solution by the end of the year.