The National Audit Office has warned that road maintenance budget cuts will cost the country more than they save.The warning comes in a review of the Department for Transport's budget cuts in the wake of the spending reviewThe NAO report said: "There is a risk now that a proportion of the budget reductions in road maintenance may not be financially sustainable."Budget reductions of £1.23 billion will be made to national and local road maintenance; however, this includes £223 million of unspecified efficiencies, risking deterioration in road quality and higher long term costs to the Department or local authorities."Continuing to meet its objectives within lower budgets will depend on the Department’s finding new ways to deliver the objectives."The 2010 spending review set a transport budget that is 15 per cent lower in 2014-15 compared with 2010-11.All areas of spending were affected, but the Highways Agency sees the biggest reduction, with a budget falling from £3.2 billion in 2010-11 to £2.1 billion in 2014-15.