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The A470 Trunk road temporary traffic restrictions
What is happening?
GORCHYMYN CEFNFFORDD YR A470 (FFIN SIROL POWYS/MERTHYR
TUDFUL I LANFAIR-YM-MUALLT, POWYS) (CYFYNGIADAU
CYFLYMDER A DIM GODDIWEDDYD DROS DRO) 2026
MAE GWEINIDOGION CYMRU wedi gwneud Gorchymyn o dan adran 14 o Ddeddf Rheoleiddio Traffig Ffyrdd 1984. Mae angen y Gorchymyn er mwyn gwneud gwaith ar gefnffordd yr A470,
neu gerllaw iddi, rhwng ffin sirol Powys/Merthyr Tudful a Llanfair-ym-Muallt, Powys.
Effaith y Gorchymyn yw gosod terfyn cyflymder dros dro o 40 mya, 30 mya neu 10 mya ar y darn o gefnffordd yr A470 rhwng ffin sirol Powys/Merthyr Tudful ym Mhont Llysiog
hyd at ei chyffordd gylchfan â’r A483 yn Llanfair-ym-Muallt. Dim ond yn ystod gwaith
confoi y bydd y terfyn cyflymder o 10 mya yn weithredol a ni chaniateir goddiweddyd ar
yr adegau hynny.
Daw’r Gorchymyn i rym ar 18 Gorffennaf 2026. Disgwylir y bydd y cyfyngiadau a’r gwaharddiad dros dro, y bydd eu hyd a’u lled yn amrywio, yn weithredol yn ysbeidiol o
08:00 o’r gloch ar y dyddiad hwnnw am gyfnod hwyaf o 18 mis. Bydd hysbysiad am y
gwaith yn cael ei arddangos cyn i unrhyw waith ddechrau.
Gellir gweld copi o’r Gorchymyn a’r Hysbysiad ar wefan Llywodraeth Cymru ar https://llyw.cymru/gorchmynion-ffyrdd.
C WYNN, Trafnidiaeth, Llywodraeth Cymru
THE A470 TRUNK ROAD (POWYS/MERTHYR TYDFIL COUNTY
BOUNDARY TO BUILTH WELLS, POWYS) (TEMPORARY SPEED
RESTRICTIONS AND NO OVERTAKING) ORDER 2026
THE WELSH MINISTERS have made an Order under section 14 of the Road Traffic Regulation Act 1984, which is necessary to undertake works on or near the A470 trunk
road between the Powys/Merthyr Tydfil county boundary and Builth Wells, Powys.
The effect of the Order is to impose a temporary 40 mph, 30 mph or 10 mph speed limit on the length of the A470 trunk road between the Powys/Merthyr Tydfil county
boundary at Pont Llysiog to its roundabout junction with the A483 at Builth Wells. The
10 mph speed limit will only apply during convoy working and no overtaking will be
permitted during these times.
The Order comes into force on 18 July 2026. The temporary restrictions and prohibition, whose extent will vary, are expected to operate intermittently from 08:00 hours on that
date for a maximum duration of 18 months. Notice of the works will be displayed before
they start.
A copy of the Order and Notice can be viewed on the Welsh Government’s website at https://gov.wales/road-orders.
C WYNN, Transport, Welsh Government
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