Killed or seriously injured (KSI) is a standard metric for safety policy, particularly in transportation and road safety.

History

ISO 39001 considers a serious injury as having an impact on the body or on the capacity of an individual.

Definition

United Kingdom definitions

United States definitions

The definitions used in the USA are as follows:

European Union

In 2014, 135,000 people were seriously injured on Europe's roads.

Issues

Figures for fatalities are normally highly reliable in industrialised countries and few if any fatalities go unrecorded. Fatality figures are however often too low making it hard to see trends over time for one place. Figures for the number of people seriously injured typically being an order of magnitude larger than the number of people killed and are therefore more likely to be statistically significant. However, classification of serious injuries is open to opinion, by medical staff or by non-medical professionals, such as police officers and may therefore vary over time and between places. Figures for slight injuries are considered highly unreliable, largely due to under-reporting where injuries are self-treated.

Derived metrics

Several metrics are derived from KSI metrics, with various goals such as international comparison which need normalization. The 28 EU-28 countries, for the 28 members, computed an indicator named "per 10 billion pkm". Pkm is an indicator of traffic volume which is used for not having consistent vehicle-kilometre data. Are counted cars and estimated motorised two-wheelers. In 2016, this indicator ranges from 23 for Sweden to 192 for Romania, with a value of 52 for the EU-28. In Germany, France, the UK and Italy, this score is respectively 33, 46, 28, 44.