Vooronderzoek verplaatsingen in het verkeer : controle op de ingevulde afstanden, augustus 1976. Onderzoek in opdracht van de Stichting Wetenschappelijk Onderzoek Verkeersveiligheid SWOV.

In a study to which inquiry method could be used to record the movements of people it is shown that most people estimate the distances too large. If a control on the recorded distances by an after-measurement on added maps is possible but cost a lot. a more accurate method of measurement is wanted.