A48(M) motorway

A48(M)
Route information
Maintained by South Wales Trunk Road Agent
Length	2.0 mi (3.2 km)
Existed	1977–present
Major junctions
East end	Castleton, Newport
Major intersections	J29 → M4 motorway
West end	St Mellons, Cardiff
Location
Primary destinations	Cardiff
Road network
Roads in the United Kingdom Motorways A and B road zones
← A38(M) → A57(M)

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]

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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[]

External links[]

Route map:

• Media related to A48(M) motorway at Wikimedia Commons
• CBRD Motorway Database – A48(M)
• Pathetic Motorways – A48(M)