In 2005, the STATS19 system was expanded to record ‘Contributory Factors’, i.e. the key actions and failures that led directly to individual accidents. These data are conceptually more complex than the ‘traditional’ STATS19 variables such as driver age or road number, so more options are available for analysis.
A TRL self-funded project has been carried out with the main aim of providing guidance about these data and effective methods for analysing them. This report documents the range of analyses that has been carried out.

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