Fuel duty will rise more slowly than previously planned, Chancellor Alistair Darling said in his Budget speech.
A previously announced 3 pence rise in fuel duty will now be staggered, with a 1p rise in April, a further 1p rise in October, and then again next January.
"This staging will ease the pressure on businesses and family incomes," said Mr Darling.
Phasing in the increase rather than raising fuel duty by 3p immediately will cost £550m.
"The decision to phase in fuel duty is the second most expensive measure Mr Darling announced, and a difficult one for the Conservatives to reverse," according to BBC economics editor Stephanie Flanders.
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