Abstract
Based on an extensive literature survey on the effects of road safety publicity strategies two field experiments were carried out. The primary aim of the experiments was to test several hypotheses on effective public information strategies in changing behaviour and /or the attitudes and cognitions of road users.The research design of the study was a so- called "pretest posttest controlgroup design".Before, during and after the publicity treatments driving speeds were measured automatically at five sites. Details about the background of the studies, the research hypotheses, and the results will be presented.