A48(M) shield
A48(M)
Route information
Maintained by South Wales Trunk Road Agent
Length2.0 mi (3.2 km)
Existed1977–present
Major junctions
East endCastleton, Newport
Major intersections
J29 → M4 motorway
West endSt Mellons, Cardiff
Location
CountryUnited Kingdom
Primary
destinations
Cardiff
Road network
← A38(M)→ A57(M)
Eastbound heading towards M4 junction 29

The A48(M) motorway in Wales links Cardiff with Newport. It is a 2-mile (3.2 km) long M4 spur. At St Mellons, it runs continuously into the dual-carriageway A48, which also has (albeit narrow) hard shoulders. The A48(M) has no other junctions and opened in 1977.[1][2] The M4 was extended from junction 29 in 1980.[3]


A48(M) motorway
Eastbound exits Junction Westbound exits
M4
London		 J29 M4 (Castleton) Start of motorway
Start of motorway
Newport		 J29A (St Mellons) A48 Cardiff

Previous A48(M) motorways

The 6-mile (9.7 km) Port Talbot bypass which opened in 1966,[2] was numbered A48(M) before its incorporation into the westward extension of the M4 in the 1970s.[4] Some maps show the Morriston bypass section of the M4 as also having been originally numbered A48(M), although whether this number was ever used on the ground has been questioned.[5]

References

  1. ↑ "A48(M) Cardiff Spur". Pathetic Motorways.
  2. 1 2 "M4 in Wales". The Motorway Archive. Archived from the original on 14 March 2007.
  3. ↑ "A48(M)". Roads. Retrieved 31 August 2020.
  4. ↑ "A48(M) Port Talbot Bypass". Pathetic Motorways.
  5. ↑ "A48(M) Morriston Bypass". Pathetic Motorways.
Template:Attached KML/A48(M) motorway
KML is from Wikidata


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North and Mid Wales
Trunk Road Agent |list1 =

  • Bangor - Chirk Trunk Road (A5)
  • London - Fishguard Trunk Road (A40)
  • Newtown - Aberystwyth Trunk Road (A44)
  • Holyhead - Chester Trunk Road (A55)
  • Shropshire Boundary - Mallwyd Trunk Road (A458)
  • Cardiff - Glan Conwy Trunk Road (A470)
  • Glanusk Park (Crickhowell) - Llyswen Trunk Road (A479)
  • Swansea - Manchester Trunk Road (A483)
  • Fishguard - Bangor Trunk Road (A487)
  • Newtown - Machynlleth Trunk Road (A489)
  • Dolgellau - South of Birkenhead Trunk Road (A494)

|group2 = Managed by the
South Wales
Trunk Road Agent |list2 =

  • M4 motorway
  • M48 motorway
  • A48(M) motorway
  • London - Fishguard Trunk Road (A40)
  • Chepstow - Carmarthen Trunk Road (A48)
  • Newport - Worcester Trunk Road (A449)
  • Neath - Abergavenny Trunk Road (A465)
  • Chepstow - Monmouth Trunk Road (A466)
  • Cardiff - Glan Conwy Trunk Road (A470)
  • St Clears - Pembroke Dock Trunk Road (A477)
  • Swansea - Manchester Trunk Road (A483)
  • Fishguard - Bangor Trunk Road (A487)
  • Newport - Shrewsbury Trunk Road (A4042)
  • East of Abercynon - East of Dowlais Trunk Road (A4060)
  • Haverfordwest - Milford Haven Trunk Road (A4076)
  • A4232 Trunk Road (Capel Llanilltern – Culverhouse Cross Link Road) (A4232)

|group3 = Related topics and
further information |list3 =

| belowclass = hlist | below =

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