Killed or seriously injured

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

Fatality figures are, however, often too low, making it hard to see trends over time for one place.

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.

[10] 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.

According to Eurostat , there is almost a linear proportion between the total number of passenger-km driven by car and road fatalities.