M4 Motorway - Temporary Prohibition Of Vehicles For Works

HYSBYSIAD STATUDOL
I gael copi print bras o’r Hysbysiad hwn, ffoniwch 0300 0604400 neu ebostiwch Trafnidiaeth.YGangenOrchmynion@llyw.cymru 

GORCHYMYN TRAFFORDD YR M4 (CYFFORDD 23A (MAGWYR), SIR FYNWY I GYFFORDD 34 (MEISGYN), RHONDDA CYNON TAF) A THRAFFORDD YR A48(M) (GWAHARDD CERBYDAU DROS DRO) 202-

MAE GWEINIDOGION CYMRU yn bwriadu gwneud Gorchymyn o dan adran 14 o Ddeddf Rheoleiddio Traffig Ffyrdd 1984 ymhen dim llai na 7 niwrnod i ddyddiad yr Hysbysiad hwn. Mae angen y Gorchymyn er mwyn gwneud gwaith ar draffordd yr M4 rhwng Cyffordd 23a (Magwyr), Sir Fynwy a Chyffordd 34 (Meisgyn), Rhondda Cynon Taf a thraffordd yr A48(M) rhwng Cyffordd 29 (Cas-bach), Casnewydd a Chyffordd 29A (Llaneirwg), Caerdydd, neu gerllaw iddynt.

Effaith y Gorchymyn arfaethedig fydd gwahardd dros dro bob cerbyd, ac eithrio’r rhai a ddefnyddir gan y gwasanaethau brys neu ar gyfer y gwaith, rhag mynd ar ddarnau penodol o’r M4/A48(M) o fewn y darnau cyffredinol a ddisgrifir yn yr Atodlen i’r Hysbysiad hwn pan fo angen gwneud gwaith mewn safle penodol. Disgrifir y trefniadau ar gyfer y llwybrau eraill yn yr Atodlen hefyd.

Daw’r Gorchymyn i rym ar 27 Gorffennaf 2026. Disgwylir y bydd y gwaharddiad dros dro yn weithredol yn ysbeidiol, dros nos (20:00 – 06:00 o’r gloch) o’r dyddiad hwnnw am gyfnod o 18 mis ar y mwyaf. Pan fo’n bosib, arddangosir hysbysiad am waharddiadau tuag un wythnos cyn bod angen cau darn penodol o’r traffordd/ traffyrdd.

P HUISH, Trafnidiaeth, Llywodraeth Cymru

YR ATODLEN
Y darnau o gerbytffyrdd tua’r gorllewin a thua’r dwyrain traffordd yr M4 wrth a rhwng Cyffordd 23a (Magwyr) a Chyffordd 34 (Meisgyn) a holl ffyrdd ymadael ac ymuno tua’r gorllewin a thua’r dwyrain yr M4 wrth y cyffyrdd hyn a rhyngddynt.

Y darn o draffordd yr A48(M) rhwng Cyffordd 29 (Cas-bach) a Chyffordd 29A (Llaneirwg).

Trefniadau ar gyfer y llwybrau eraill
Codir arwyddion priodol i nodi’r gwyriad ar gyfer y llwybrau eraill a byddant yn amrywio gan ddibynnu ar ben y daith a phryd y bydd darn penodol o’r M4 neu’r A48(M) ar gau dros dro i draffig.

Bydd y llwybrau eraill ar gael drwy fynd ar y brif M4, yr M48, yr A4042, yr A4051, yr A4810, yr A48, y B4591, yr A467, yr A4232, yr A48(M), yr A470, yr A473 a’r A4119, fel y bo’n briodol.

STATUTORY NOTICE
For a large print copy of this Notice contact 0300 0604400 or email Transportordersbranch@gov.wales 

THE M4 MOTORWAY (JUNCTION 23A (MAGOR), MONMOUTHSHIRE
TO JUNCTION 34 (MISKIN), RHONDDA CYNON TAF) & THE A48(M)
MOTORWAY (TEMPORARY PROHIBITION OF VEHICLES) ORDER 202-

THE WELSH MINISTERS propose, in not less than 7 days from the date of this notice, to make an Order under section 14 of the Road Traffic Regulation Act 1984, which is necessary to undertake works on or near the M4 motorway between Junction 23a (Magor), Monmouthshire and Junction 34 (Miskin), Rhondda Cynon Taf and the A48(M) motorway between Junction 29 (Castleton), Newport and Junction 29A (St Mellons), Cardiff.

The effect of the proposed Order will be to temporarily prohibit all vehicles, other than those being used by the emergency services and for the works, from proceeding on certain lengths of the M4/A48(M) motorways within the overall lengths described in the Schedule to this Notice when work is required at a particular site. The alternative route arrangements are also described in the Schedule.

The Order will come into force on 27 July 2026. The temporary prohibition is expected to operate intermittently, overnight (20:00 hours – 06:00 hours) from that date for a maximum duration of 18 months. Where possible, notice of prohibitions will be displayed approximately one week before the closure of a specified length of the motorway(s).

P HUISH, Transport, Welsh Government

SCHEDULE
The lengths of the westbound and eastbound carriageways of the M4 motorway at and between Junction 23a (Magor) and Junction 34 (Miskin) and all M4 westbound and eastbound exit and entry slip roads at and between these junctions.

The length of the A48(M) motorway between Junction 29 (Castleton) and Junction 29A (St Mellons).

Alternative route arrangements
The alternative routes will be indicated with appropriate diversion signs and will vary depending on destination and when a particular length of the M4 or A48(M) is temporarily closed to traffic.

Alternative routes will be available via the main M4, M48, A4042, A4051, A4810, A48, B4591, A467, A4232, A48(M), A470, A473 and A4119, as appropriate.