A48(M) motorway
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. The M4 was extended west or southwest from junction 29 in 1980.
A48(M) | ||||
|---|---|---|---|---|
| Route information | ||||
| Maintained by South Wales Trunk Road Agent | ||||
| Length | 2.0 mi (3.2 km) | |||
| Existed | 1977–present | |||
| Major junctions | ||||
| Northeast end | Castleton, Newport | |||
| J29 → M4 motorway | ||||
| Southwest end | St Mellons, Cardiff | |||
| Location | ||||
| Country | United Kingdom | |||
| Counties | Gwent, South Glamorgan | |||
| Primary destinations | Cardiff | |||
| Road network | ||||
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| A48(M) motorway | ||
| North-Eastbound exits | Junction | South-Westbound exits |
| M4 London |
J29 M4 (Castleton) | Start of motorway |
| Entering Gwent | Entering South Glamorgan | |
| Start of motorway Newport |
J29A (St Mellons) | A48 Cardiff |
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