Any decisions on future schemes would be taken following the spending review.
Tolling the M4 in Wales would be a matter for the Welsh Assembly.
More top news
The body of a man from Chichester who died after travelling to Syria to fight Islamic State arrived back at Heathrow to a hero's welcome.
London Mayor Sadiq Khan hinted that he could go further in his bid to tackle pollution in the capital.
Donald Trump has left many baffled after appearing to refer to a terror incident in Sweden on Friday night, except no attack occurred.