Abercynon Roundabout
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| Abercynon Roundabout Cylchfan Abercynon | |||
| Location Map ( geo) | |||
| |||
| Location | |||
| Abercynon | |||
| County | |||
| Glamorgan | |||
| Highway Authority | |||
| Welsh Government | |||
| Junction Type | |||
| Roundabout | |||
| Roads Joined | |||
| A40, A472, A4059 | |||
| Junctions related to the A470 | |||
Coryton Interchange • Glan Conwy Interchange • Brynich roundabout • Gabalfa Interchange • Bala Junction • Abercanaid Roundabout • Cefn Coed Roundabout • Tarell roundabout • Moat Lane Junction • Cemmaes Road Roundabout • Mallwyd • Cross Foxes • Taffs Well Interchange • Nantgarw Interchange • Llyswen junction • Llanidloes roundabout • Gellideg roundabout • Rhyd-y-car roundabout • Bridge Street Interchange • Broadway Interchange • Glyntaff Interchange • Upper Boat Interchange • Llangurig roundabout • The Flourish • Waterloo Bridge (Caernarfonshire) | |||
Abercynon Roundabout is the first at-grade roundabout on the A470 Cardiff - Merthyr dual carriageway, mainly serving the upper Taff Valley at Merthyr Vale and the Cynon Valley to Aberdare.
History
It was originally planned as a Roundabout interchange in the 1960s but by the time it opened in 1985 it was downgraded to a roundabout.
The junction opened from the south on 20 June 1985 per the Land Compensation Act notice. The section northwards opened on 4 November 1985.
Routes
| Route | To | Notes |
| Cardiff/Caerdydd, M4, Pontypridd | ||
| Merthyr Tydfil | ||
| Ystrad Mynach, Aberfan (A4054), Treharris, Nelson, Abercynon, Cilfynydd, Park and Ride | ||
| Aberdare/Aberdar, Mountain Ash/Aberpennar, Abercynon (West) |