Samenvatting
Design and results are presented of the first phase of a research on "Problem situations". The research is meant to indicate points of action for measures improving traffic safety on "main roads inside built- up areas". The main "problem situations": sections of roads with one lane and (with or without) bicycle tracks, having the highest number of accidents; roads with two lanes and bicycle tracks; sections of highways where parking provisions have been built. On the basis of this phase the program for the second phase will be made.