The research unit in the survey is the company, together with its vehicle(s). For this, the number of companies has been divided into 52 groups. Each group is a representative sample of the total. The following compilation aspects have been taken into account:
Every year, each group is asked to fill in a questionnaire about its haulage on public roads within the Benelux for 1 week. The haulage concerns loaded journeys and the loaded and unloaded kilometres involved. All vehicles used for transport are included. By surveying a group of companies each week, the traffic and transport data gathered is spread over the whole year. The weekly results are extrapolated to quarterly and annual figures.