Danny Alexander, Chief Secretary to the Treasury, said: "Secondly, we will deliver all of the major projects in the Highways Agency Pipeline.
"We will add two lanes to the busiest motorways – bringing another 221 lane miles to our road network.
"It will see us tackle some of the most congested parts of our network.
"Like the £1.5 billion A14 scheme between Huntingdon and Cambridge.
"This is a scheme of strategic national importance, which will unlock jobs, housing and growth in the region, as well as providing key relief for a major freight route.
"And I am delighted to announce that we will be bringing forward the start of construction by almost 2 years, to 2016."