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This executive summary covers the objectives, processes, achievements and suggestions for best practice relating to the Steering Group that the NZ Transport Agency requested be established to provide guidance for transport modelling associated with major projects in the Wellington Region, with the Petone to Grenada (P2G) project the first to benefit from this approach.

It should be noted that this report was undertaken after the multi-criteria assessment (MCA) and was not used as part of the decision making process that resulted in Option C (managed motorway) being selected as the preferred option to take forward to the next SAR stage of the project. The conclusions drawn from this report do, however, confirm that the MCA findings can still be considered robust.