Jams tomorrow: Ministers unveil plans to dig up a road near you as part of £100billion fund to get Britain building Cash for the next six years to repair Britain's crumbling roads Includes enough money to fill 19 million potholes every year 21,000 miles of resurfacing - equivalent of London to Beijing and back Routes in line for upgrades include A14, A19, M6, M4, M1 and A303 But Labour says capital spending is being cut from 2015 Britain's crumbling roads are to get a multi-billion pound makeover in what the government claims is the biggest investment in the highways for four decades. Ministers unveiled details of £100billion in spending to overhaul the nation's infrastructure, including £28billion in the next six years to repair and improve motorways and local roads. It includes enough money to fill 19 million potholes every year, resurface a total of 21,000 miles of highways, add two lanes to the busiest motorways and ease congestion on the busiest junctions in the UK. The massive plan, most of which will start work after the 2015 election, raises the prospect of roadworks springing up across the country with the potential to cause long tailbacks as the work is carried out. Construction: The government unveiled plans for major infrastructure works to begin across the country, but most will not start for several years Ministers insist the short-term pain will be worth it to finally get a grip on the backlog of repairs which have left Britain's roads breaking up. Chief Secretary to the Treasury Danny Alexander used a statement in the Commons lay out details of £100 billion of spending on infrastructure. He said it included the biggest public housing programme for over twenty years, the largest programme of rail investment since Victorian times, the provision of fast internet access across the whole country for the first time and massive investment in new nuclear and green power. The package also includes "the greatest investment in our roads since the 1970s." Mr Alexander said: "Millions of people rely on our road network. "But our road system has been decaying for decades, and without further significant investment now, by 2040 nearly a quarter of all those motorists" travel time could be spent stuck in traffic. We will take action to fix the backlog of maintenance, which has left road surfaces in communities up and down the country crumbling. Where our predecessors left our road network on the hard shoulder, we are bringing it into the fast lane. Not only are we building the roads of the future, we are also developing the cars of the future. Repairs: Chief Secretary to the Treasury Danny Alexander said there was enough money to fill 19million potholes every year Up to £30billion has been promised to the railways, the biggest investment since the Victorians. Danny Alexander defended the bill for High Speed 2 rising to by £10billion to £42.6billion, insisting the fast link between London, Birmingham and the North will "change the economic geography of our country." Network Rail is also conducting a feasibility study into electrifying the Lakes Line between Oxenholme and Windermere. From 2015 funding will be in place to begin work to electrify the line which connects Gospel Oak and Barking in London. An extra £2 million is being committed to support a study into the proposed Crossrail 2 link in London. Iconic stations like Kings Cross, Manchester Piccadilly and Birmingham New Street are being upgraded. A new line will open from Bedford to Oxford, links between Liverpool and Newcastle will be upgraded and 850 miles of railway are being electrified. It includes £10 billion of investment in road repairs between 2015-16 and 2020-21. "More than £4 billion of that money will be spent on national road maintenance - enough to resurface over 21,000 miles of road; the equivalent of London to Beijing and back," Mr Alexander said. The other £6 billion of that money will be spent at a local level - allowing Local Authorities to fill the equivalent of 19 million pot holes a year. The green light has also been given to every major road project identified by the Highways Agency Pipeline. It includes adding two lanes to the busiest motorways and tackling some of the worst congestion bottlenecks. It includes upgrading the A14 scheme between Huntingdon and Cambridge, which will start two years earlier in 2016. Other schemes given the go ahead include improvements to the A19 between Newcastle and South Shields; the A63 in Hull, the M6 junctions between Birmingham and Manchester, the M5 junctions from Bromsgrove to Worcester, the A38 Derby Junctions, the M1 junction near Long Eaton and south of Rugby, the A21 Tonbridge to Pembury, junctions on the M4, the M23 Gatwick junctions and the A27 Chichester bypass. Mr Alexander also promised money to "identify and deliver solutions for the most notorious problem spots across the country." The notorious stretch of the A303 connecting Hampshire to Cornwall is among the roads which could be overhauled. The A1 north of Newcastle and the A27 corridor, the trans-Pennine route, and connectivity to Leeds Airport will also be examined. The Highways Agency will also become a publicly owned corporation. However, Labour dismissed the promises as "hot air" and said capital spending was actually going down in 2015-16. Shadow chief secretary Chris Leslie said: "Why doesn't he come clean and admit that what he's really doing is cutting the capital investment budget overall, in real terms, by 1.7 per cent in 2015/16? Isn't the truth that there is no new money for infrastructure here? And you are spinning a line, rolling multiple years together, to make it sound like a big figure, reheating old announcements in his microwave statement that should have turned into action long, long ago. Upgrade: Ministers are to launch a study in how to improve the A£0£ connecting the South East to Cornwall, which pass Stonehenge Business leaders welcomed the investment plans - but warned they needed to be put into action quickly. Dr Adam Marshall, director of policy at the British Chambers of Commerce (BCC) said: "Infrastructure projects are too often promised and too rarely delivered in this country, and that cycle must be broken. If these announcements are to translate into short-term confidence, medium-term construction jobs and long-term competitiveness, the Whitehall machine must be judged by the number of diggers on the ground, not strategies and press notices.