Abstract
In this study the role of perception in accidents and the effects of the introduction of daytime running lights (DRL) have been reviewed on the basis of all 24 existing DRL evaluations. Additional statistical analysis and new techniques have been employed to produce the best estimates possible of the full effects of the DRL introduction in the EU in terms of the saving of lives and reducing the costs of road accidents. The difference between national and company fleet DRL-effects and the difference between DRL-effects on accidents and on casualties have been investigated as well as the relation between latitude and DRL-effects. (A)