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The Welsh Government’s traffic information service for motorways and trunk roads in Wales

A465 Aberdulais Roundabout East and West Overbridge- Essential Bridge Deck Refurbishment Works


Where and Why?

Starting 23/05/2021, the essential bridge deck refurbishment works will be undertaken on the A465 Aberdulais roundabout.

Built in 1975, the 65 metre long Aberdulais Overbidge spans the A465 and the Tennant canal. The bridge is 46 years old and is in need of repair. During a recent inspection, a structural defect was identified in the columns supporting the bridge deck. A lane closure and temporary propping system were put in place initially but now a permanent repair is to be undertaken.

The first phase of works will include critical concrete repairs to this column. Followed by further bridge deck refurbishment and waterproofing works under full closures during the school summer holidays.

Diversions and Safety Measures

The works will require a series of total and lane closures of the gyratory carriageway between the A465 eastbound onslip and exit to Tonna/Neath (A465). Traffic will be diverted east on the A465 to Resolven and back to Aberdulais on the A465.

Diversion Route

Programme of traffic management restrictions

Start Date & Time*

End date & Time*

Traffic Management

23rd May 08:00

28th May 

24/7 road closure to undertake critical concrete repairs for 5 days

19th July 20:00

13th August 20:00

24/7 road closure for deck refurbishment– 4 weeks

13th Sept 20:00

24th Sept 06:00

Overnight road closure to replace expansion joint  – 2 weeks


** Please note, programme may be subject to change.


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

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