South Wales Trunk Road Agency

Did You Know…..???

The Brynglas Tunnels on the M4 are cleaned every month. A contra flow is put in place overnight on weekends and each side is completely closed off in-turn. The tunnels undergo a complete cleaning and general maintenance regime and all put back to normal for the next day.

Imagine the delays if this were done during the day!

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South Wales Trunk Road Agency - Fact and Figures

 

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