A48(M) motorway

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
M4 London	J29 M4 (Castleton)	Start of motorway
Start of motorway Newport	J29A (St Mellons)	A48 Cardiff

A48(M)
Route information
Maintained by South Wales Trunk Road Agency
Length	2.0 mi (3.2 km)
Existed	1977–present
Major junctions
East end	Castleton, Newport
	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

Eastbound heading towards M4 junction 29

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. Pathetic Motorways – A48(M)
2. 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

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