 The M1 is to be widened from London to Milton Keynes |
Proposals to widen motorways across the east of England form part of the government's �7bn transport package. On Wednesday, Transport Secretary Alistair Darling announced details of its road and rail plans following a year-long feasibility study.
The proposals include extra lanes on the M1 from London to Milton Keynes, on the M25, A12 from London to Ipswich, and A120.
But plans to fully dual the A47 from Norwich to Peterborough have been rejected.
In detail Wednesday's schemes include:
The widening of the M1 between the M25 and Milton Keynes in Buckinghamshire to four lanes at a cost of �623m A �246m package of improvements to the A12 corridor, including the upgrade of the A12 to dual three lanes between the M25 and Chelmsford in Essex  The plans will aim to cut congestion |
Dualling the A120 between Braintree and Marks Tey in Essex at a cost of �203m Dunstable Northern Bypass linking the A5 to M1 in Bedfordshire - �48m Dualling eight miles of the A421 between the M1 and Bedford - �171m Plans to widen most of the remaining three-lane sections of London's orbital M25 to four lanes with �1.7bn investment over the next decade Plans to widen the M11 north of London between junctions 8 and 9 - �171m Capacity improvements to the M1, M18, M62. On the railways, new services Bedford and Oxford are being brought forward, as well as new services to Heathrow.
But the Department for Transport has rejected a new rail services between Bedford and Northampton at this stage.
Mr Darling said on Wednesday: "The M1 and the A12 are important transport corridors. Improvements announced will make journey times more reliable and the motorway safer by reducing congestion and accidents."
But the plans have been criticised by the environment group the CPRE which said the proposals "threaten large areas of countryside".