The co-operation between the four transport agencies have been concentrated on the more general transport policy and less on the means the agencies themselves have at hand. The institutional differences between the agencies explain some of the differences in the agencies work with the plan. The Public Road Administration has most resources, largest funding and the longest experience making them play the leading role, also independent from their formal role in heading the planning process. The process was closely co-ordinated with the ordinary planning processes in the agency. The National Rail is next to the PRA in involvement in the mutual processes and internal co-ordination of the work. The National Coastal Administration has been participating actively in the co-operation but has fewer resources and planning skills than the other two. The Civil Aviation Administration has fewer interests at stake in the transport planning process and has therefore involved them the least. The planning methods and definitions have probably strengthened the leading role of the PRA and reduced the position of the NCA and the CAA.