Guidance

Guide to injury-based reporting and severity adjustments for road casualty statistics

This document outlines the changes to severity recording in some police forces from 2016 and method used to adjust for this in the reported road casualty statistics.

• From: Department for Transport
• Published: 13 October 2021
• Last updated: 28 November 2024 — See all updates

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Guide to severity adjustments for reported road casualties Great Britain

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Since 2012, some police forces have moved to injury-based reporting systems which has impacted on the number of serious and slight injuries reported, affecting trends over time. The department has developed a method to adjust for this change.

The Office for National Statistics (ONS) Methodology Advisory Service have developed a methodology to quantify the effect of the introduction of injury based reporting systems on the number of slight and serious injuries reported to the police, and to estimate the level of slight and serious injuries as if all police forces were using injury-based reporting systems.

This guide provides a brief overview of the method and guidance on when to use the adjusted figures.

Full technical details of the adjustment methodology can be found in the final technical report, and the further annex.

Published 13 October 2021
Last updated 28 November 2024 + show all updates

1. 28 November 2024

   Updated for 2023 statistics.

2. 28 September 2023

   2022 reported road casualties Great Britain published.

3. 13 October 2021

   First published.