A48(M) motorway

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A48(M) shield
Route information
Maintained by South Wales Trunk Road Agency
Length2.0 mi (3.2 km)
Major junctions
East endCastleton, Newport
 Junction 29.svg UK-Motorway-M4.svg
J29 → M4 motorway
West endSt Mellons, Cardiff

Road network
Eastbound heading towards M4 junction 29

The A48(M) motorway in Wales links Cardiff with Newport. It is a 2 miles (3.2 km) long, M4 spur. At St Mellons, it runs continuously into the dual-carriageway A48, which also features (albeit narrow) hard shoulders. The A48(M) has no 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
J29 M4 (Castleton) Start of motorway
Start of motorway
J29A (St Mellons) A48 Cardiff

Previous A48(M) motorways[edit]

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]


  1. ^ Pathetic Motorways – A48(M)
  2. ^ a b The Motorway Archive – M4 Dates Archived 14 March 2007 at the Wayback Machine
  3. ^ "A48(M)". Roads.org.uk. Retrieved 31 August 2020.
  4. ^ Pathetic Motorways – A48(M) Port Talbot Bypass
  5. ^ Pathetic Motorways – A48(M) Morriston Bypass

External links[edit]

Route map:

KML is from Wikidata