Lisa Hansson, Ph D, is Associate Professor in Political Science at Molde University College – Specialized University in Logistics.

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Viking travellers and colonists were seen at many points in history as brutal raiders.

Many historical documents suggest that their invasion of other countries was retaliation in response to the encroachment upon tribal lands by Christian missionaries, and perhaps by the Saxon Wars prosecuted by Charlemagne and his kin to the south, or were motivated by overpopulation, trade inequities, and the lack of viable farmland in their homeland.

Instead, they rely on their embedded professional knowledge, which is sometimes outdated or misleading.

In other cases, planners disregard the knowledge because it challenges planning agendas or compelling ideas, or they exercise self-censorship when finding that it conflicts with political agendas.

Combining qualitative and quantitative research methods, Næss has for more than two decades carried out research into influences of urban structures on travel behavior, mainly in the Nordic countries, but also in China and Southern Europe.

Næss is member of the Executive Board of the World Society for Transport and Land Use Research.Main research interests are effects of land use and transport systems developments on traffic, environment and society, urban development for sustainable and attractive cities, planning and decision-making processes, the roles of planners in planning processes and use of knowledge in urban planning.She has received best paper awards at international conferences for works on these issues.The expert knowledge in question concerns how land-use and transport systems development influence traffic volumes in urban regions.The article concludes that whether planners use the expert knowledge in question or not, and how they use it, do affect the goal achievement potential of the plans they produce.Considerable effort is required in ensuring higher goal achievement potential in future plans.