Organisation: Department for Transport
Date of Publication: September 2025
Uploaded to Knowledge Centre: 15 December 2025
This guidance relates to the reporting of road safety factors (RSFs) and contributory factors (CFs) within the STATS19 road collision data collection.
CFs were first added to the data collection from 2005, to provide insight into reasons why collisions occur.
As a result of recommendations in the 2018 STATS19 review, the collection system is changing from CFs to the new RSFs, which have been designed to facilitate more consistent recording.
Currently some forces are still recording data as CFs, while others have move to RSFs, and the impact of this transition is outlined in the guidance.
Click the link below to access the guidance:
https://www.gov.uk/government/publications/guide-to-contributory-factors-for-reported-road-casualty-statistics/guide-to-contributory-factors-for-reported-road-casualties-great-britain#transition-to-road-safety-factors