Guidance

Guide to severity adjustments for reported 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 September 2023 — See all updates

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Guide to severity adjustments for reported road casualties Great Britain

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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.

Published 13 October 2021
Last updated 28 September 2023 + show all updates

1. 28 September 2023

   2022 reported road casualties Great Britain published.

2. 13 October 2021

   First published.