Mallwyd

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Mallwyd
Location Map ( geo)
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Location
Mallwyd
County
Merionethshire
Highway Authority
Welsh Government
Junction Type
roundabout
Roads Joined
A458, A470
Junctions related to the A458
Churncote Roundabout • Reabrook Roundabout • Sarn Bryn Caled Roundabout • Shelton • The Column Roundabout • Weeping Cross Island (Shrewsbury)

Mallwyd is an important junction in Mid Wales. Historically it was where where traffic heading west from Shrewsbury to the Merionethshire coast split between Dolgellau and Machynlleth.

History

Road numbers 1922-1935

Originally, this was a crossroads. In 1922 the roads to the south and north east became the A491 route between Shrewsbury and Machynlleth, while the road to the north west became the A4084 route linking the A491 to Dolgellau. In 1935 the route numbers entirely changed: the A458 was extended from Shrewsbury to Dolgellau and the A4084 switched to run south of the junction towards Machynlleth.

Road numbers post 1935, showing the roads as trunk roads

In 1946, the A458 was trunked. In the mid-50s, the A4084 was also trunked. The A470 renumbering took the A4084 number from the junction, after over 50 years, taking over both routes that have held that number.

Routes

Route To Notes

A458

Y Trallwng / Welshpool

A470

Dolgellau, Dinas Mawddwy

A470

Llangurig, Machynlleth, Y Drenewydd / Newtown (A489)
7'6" width limit 350yds ahead / ymhen 350 llath

A458

Dolgellau, Dinas Mawddwy post-1935, now A470

A491

Y Trallwng / Welshpool post-1935, now A458

A491

Machynlleth pre-1935, now A470

A4084

Dolgellau, Dinas Mawddwy pre-1935, now A470

A4084

Machynlleth, Llangurig, Y Drenewydd / Newtown (A489) post-1935, now A470



Mallwyd
Junctions on Welsh South-North Trunk routes
A470Gabalfa • Coryton • Taff's Well • Nantgawr • Upper Boat • Glyntaff • Broadway • Bridge Street • Abercynon • Abercanaid • Rhyd-y-car • Gellideg • Cefn Coed • Tarell • Brynich • Llyswen • Llangurig Rdbt • Llanidloes Rdbt • Moat Lane • Cemmaes Road • Mallwyd • Cross Foxes • Bala Jct • Glan Conwy
A483Earlswood • Penllergaer • Port Abraham • Crossgates Rbdt • Sarn Bryn Caled Rdbt • Old Station Rdbt • Llynclys Crossroads • Mile End Rdbt • Five Crosses • Gledrid • Halton Rdbt • 1 Ruabon • 2 Johnstown • 3 Croesfoel • 4 Ruthin Road • 5 Mold Road • 6 Gresford • 7 Rossett • Wrexham Road • Overglen Rdbt
A487Merlin's Bridge • Windyhall • Rafael • Ridgeway • Hospital • Southgate • Cross Foxes • Bala Jct • Minffordd • Porthmadog • Tremadog • Goat Rdbt • Bontnewydd Rdbt • Meiford Rdbt • Pont Seiont Rdbt • Eagles Jct • St Davids Rdbt • Cibyn Rdbt • Plas Menai Rdbt • Y Felinheli Rdbt • Treborth • Antelope Rdbt
A4042
A479
Grove Park • Croes-Y-Mwyalch • Crown Rdbt • Turnpike Rdbt • Edlogan Way Rdbt • Cwmbran Rdbt • Pontypool Rdbt • Court Farm Rdbt • Mamhilad Rdbt • Hardwick
Glanusk Park • Marish • Dderw • Llyswen