Abstract
The former Dienst Verkeerskunde of Rijkswaterstaat requested a study into the use of length of time as weighing factor for the lack of traffic safety. This was carried out by SWOV Institute for Road Safety Research. This study briefly reviews the literature to describe the 'time' factor as a possible measure for travel risk. One of the central terms within the literature study is journey time. The study also describes briefly the direction for further research into the relationship between personal mobility and traffic safety.