M48 motorway: the Severn Bridge connection between England and Wales

Characteristics and route

The motorway follows a relatively short, mostly rural course that includes the Severn Bridge, a long-span suspension crossing. It connects into the wider motorway network at either end, serving commuters, commercial vehicles and tourist traffic. The M48 is a two- to three-lane motorway in places and is signed and maintained to national motorway standards.

History and development

The route was originally built as part of the M4 when the Severn Bridge opened in the mid-1960s, providing a new link between southern England and south Wales. After a newer river crossing was completed in the mid-1990s, the original M4 alignment across the first bridge was renumbered as the M48. This renumbering reflected changes in traffic patterns brought by the additional crossing.

Uses and significance

The M48 serves a mix of local and longer-distance journeys. It is valued for its scenic views over the Severn estuary and as an alternative to busier crossings. The corridor has supported economic ties between the two countries and remains useful when traffic or maintenance affects the newer crossing.

Notable facts

• Length: approximately 12 miles (19 km).
• Crosses the Severn estuary on the original Severn Bridge, a suspension structure.
• The route was renumbered from the M4 after a second crossing opened.
• Tolls formerly applied on Severn crossings have been removed in recent years, changing travel patterns.

For route planning, up-to-date traffic information and local junction details consult national transport resources or relevant local authorities via official guidance and regional pages such as those for Gloucestershire and Monmouthshire.