Severn Bridge

The Severn Bridge is a motorway suspension bridge that spans the River Severn between South Gloucestershire in England and Monmouthshire in South East Wales. It is the original Severn road crossing between England and Wales, and took three and a half years to build, at a cost of £8 million. It replaced the 137-year-old Aust Ferry.

The bridge was opened in 1966 by Queen Elizabeth II. For thirty years, the bridge carried the M4 motorway. It was granted Grade I listed status in 1999.Following the completion of the Prince of Wales Bridge, the section of motorway from Olveston in England to Magor in Wales was designated the M48.

Source: Wikipedia