In this Report, four parallel investigations were undertaken: road user effects; construction costs and engineering considerations; environmental impact; and social impact.

In examining possible route locations in each corridor the four investigations were progressively carried out in more detail as alternatives were eliminated, until the best alternative became apparent. At this stage road user effects were quantified and a benefit-cost ratio was used to assess the economic warrant for construction of the preferred alternative.

The investigations identified various aspects requiring further and more detailed study during selection of the precise location and the design and the construction stages.

• National Highways Linking Sydney, Melbourne and Canberra Third Report: Canberra Connections, 1979
  

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