The Aberdeen bypass has been given the go-ahead, more than six years after the plans were first announced by the then First Minister Jack McConnell.
The 28-mile road is aimed at easing traffic and improving business in the north east.
But opponents - such as campaign group Road Sense - have criticised the cost and the potential environmental impact of the project.
Here is a chronology of events in the development.
Monday, 21 December 2009
Controversial plans to build a bypass around Aberdeen are approved by ministers.
Finance Secretary John Swinney describes it as one of the most important infrastructure projects in the north east, which will "bring a range of substantial benefits to the region".
The move is welcomed by business groups and local councils.
But the group Road Sense, which has been campaigning against the development, says it is extremely disappointed at the decision.
Monday, 7 December 2009
Road Sense claims the discovery of bats in one of the buildings earmarked for demolition may affect the development.
It says the bats are protected and cannot be disturbed unless there is no other option.
But the Scottish government says the future of the bats is being considered as part of a public inquiry.
The inquiry concluded in December 2008, leaving the three reporters to make their recommendations.
Tuesday, 17 November 2009
It emerges that it will cost £51m to move a school to make way for the road.
The International School in Milltimber was founded in 1972 and specialises in educating students of all nationalities.
A campaign group says the costs cannot be justified and should signal the end of the bypass plans.
But Transport Scotland says provisions are still being made for the scheme at between £295m and £395m.
Friday, 12 October 2007
Ministers announce that a public inquiry into the proposed bypass will be held in 2008.
The Scottish government says that on the basis of 8,000 objections received so far there is a clear need to consider these formally.
It comes after changes to the 28-mile proposed route were published, including a reduction in the number of houses to be demolished.
A date of 2012 is targeted for the completion of the bypass.
Thursday, 1 February 2007
A school facing demolition to allow the bypass to be built lodges a planning application to relocate.
The school is planning to move from Milltimber to a new site at Pitfodels.
It is understood an alternative garden centre site on council-owned land at Skene has already been identified.
The proposed new school includes a swimming pool, sports pitches and a gymnasium.
Sunday, 19 February 2006
Residents living on the chosen route for the bypass form an opposition group.
The group - Road Sense - is against a new road through the Milltimber suburb.
It is angry that the then-Scottish Executive's public consultation options did not include the route which was eventually chosen.
Transport Minister Tavish Scott rejected the original options in favour of a compromise route through Milltimber Brae, with a new fast link via Netherley to Stonehaven.
Thursday, 1 December 2005
The transport minister announces that the bypass will not cut through land used by a community for people with special needs.
Campaigners welcome the news that the Camphill community's Newton Dee site is being spared.
The cheaper Murtle option, which would have split the two Camphill communities for adults and children with special needs, was Aberdeen and Aberdeenshire councils' preferred route.
But Tavish Scott rejects that in favour of a compromise route through Milltimber.
Monday, 27 January 2003
The then First Minister Jack McConnell announces plans to build a bypass around Aberdeen to ease congestion.
Mr McConnell says the executive hopes it would take less than the previously proposed nine years to complete the route.
The proposals were advanced following meetings the previous weekend.
The first minister says the funding model would be along the lines of that in place for the M74 in the central belt.