The Britannia Bridge carries the A55 North Wales Expressway and a railway line over which strait?

Britannia Bridge, known as Pont Britannia in Welsh, is a bridge that crosses the Menai Strait from the island of Anglesey to the mainland of Wales. The original bridge was designed and built by British engineer Robert Stephenson (1803-59) to carry rail traffic. The foundation stone of the Britannia Bridge was laid on 10th April 1846. Stephenson fitted the last rivet of the bridge on 5th March 1850.

On 23rd May 1970, the bridge was damaged when boys playing inside the structure dropped a burning torch. Although the bridge remained standing, the fire significantly damaged the original architecture. The repair took several years and the bridge remained closed to the railway until 1974. In 1980, the new road crossing was completed, which carries a section of the A5 road (now the A55) over the Menai Strait.

The Menai Strait is a narrow stretch of water separating the island of Anglesey from mainland of Wales. The straight is about 25 km (15.5 mile) long. As well as the Britannia Bridge, the strait is crossed by the Menai Suspension Bridge.

The A55 is a 140 km (87 mile) long road that stretches from Holyhead on the island of Anglesey to Chester in Cheshire, England, on the River Dee, close to the border of Wales.