The new bridge would join Thomas Telford's structure built almost 200 years ago, and Robert Stephenson's Britannia Bridge, which originally carried just rail traffic when it opened in the mid 19th century but was later rebuilt to carry road vehicles too.

Other planned projects announced in this week’s budget include major improvements to the M4, A55, A40 and A494 motorways as well as work on metros for both the north and south of the country. The package of schemes is heralded by the Welsh government as the biggest investment in infrastructure since devolution.

“Our historic, multi-billion-pound investment  shows how serious this Welsh Government is about delivering a world-class transport system in Wales – one that sustainably connects people and communities to jobs and services and drives our economy forward,” said economy and infrastructure secretary Ken Skates. 

He added: “I also want to establish a better informed, better designed, long-term, evidenced-based approach to the planning of our transport network and the National Infrastructure Commission, which we are proposing, alongside an updated Welsh Transport Planning and Appraisal Guidance, will help ensure this.”