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Traffic Wales information line 0300 123 1213
The Welsh Government’s traffic information service for motorways and trunk roads in Wales

A40 Gibraltar Hill Tunnels Monmouth - Planned Maintenance Works 16th - 19th May 2020


Where and Why?

A contraflow arrangement will be installed on the A40 Gibraltar Tunnels, Monmouth to carry out essential maintenance works in both the northbound and southbound tunnel bores.

The contraflow will be in place from 12.00hrs on Saturday 16th May 2020 until 18.00hrs on Tuesday 19th May  2020.

Diversions and Safety Measures

During the entire closure period, all wide abnormal load (Width greater than 3 meters and length no more than 16.5 meters) will be requested to use the M5 & M4 to enter and exit South Wales.

Electronic and Hard advance signage will be utilised on the M4, A465, A40 and the A449 where possible to advise motorist to “Plan Ahead, Delays Expected, Monmouth” during these dates.

Highways England will also be contacted and advised, if possible, to set signs on the M5 southbound, more especially for wide/abnormal loads heading into South Wales.

All works will be carried out in accordance with social distancing measures.

For more information see:


For further information, please contact Traffic Wales on 0300 123 1213 or via Twitter @TrafficWalesS.

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