AA roads policy head Paul Watters said: "Drivers will be delighted to hear of the bold plans but hope this won't be let down by slow, patchy delivery. Potholes are here and now and our traffic jams just get worse.
"We welcome plans to transform the Highways Agency into a public corporation with a clear brief and guaranteed funding free of political intervention. But UK drivers remain fearful of paying more to use our roads - after all, they already contribute £46 billion each year in tax.
"If new schemes involve tolls they will be highly contentious and, while adding motorway lanes is very welcome, pinching the hard shoulder to do this may be regarded by some as doing this on the cheap. Overall this is very good news today, but the devil will be in some of the detail."
The Government must "pull its finger out and start building", Labour said in the wake of today's raft of infrastructure announcements.
Pothole repairs and improvement plans for the A21 in Kent, junctions on the M4, the M23 Gatwick and the A27 Chichester bypass announced.