Wales' Transport Minister, Carl Sargeant, told us the Heads of the Valleys road is vital for people to access jobs, and for the economy to function properly.
The Deputy Minister for European Programmes, Alun Davies, said it is 'fundamental' infrastructure, which 'enables us to compete on the Welsh, UK, European and world stage.'
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Feeling humid with heavy showers and thunderstorms moving north overnight into Sunday.
Four people, including three children, were taken to hospital to be checked for smoke inhalation.
Heavy rain and thunderstorms will affect many parts of Wales this weekend - particularly during Saturday evening.