Driver fatigue is estimated to be a (contributing) factor in 15 to 20% of crashes, but estimates in individual studies vary widely. Drivers who are tired are less attentive and react less quickly and less adequately than drivers who are not tired. They also get irritated and frustrated more easily.
Fact sheets
SWOV fact sheets contain concise relevant knowledge on topics within the road safety themes and are updated regularly. Also view 'Road safety in numbers'. This allows you to work with the available data and make your own selections.