The Government is to invest £3bn in capital projects, including the “increasing of capacity in the motorway network”.

The spending is likely to go on schemes such as increasing hard-shoulder running, rather than widening the existing roads.

The £3bn of capital spending is also being shared with social housing, schools and energy efficiency projects. The money was due to be spent over the 2010/11 tax year, but has been brought forward to this tax year.

Chancellor Alistair Darling said the investment was being brought forward to increase the number of jobs available and put more money into the economy.

He claims: “I have looked at these programmes in detail, and I know they can be delivered on this revised timescale.”