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Percentage reduction in road deaths and serious injuries, all - WMCA

Killed or Seriously Injured (KSI) Road Traffic Accidents Indicator: This indicator measures the percentage change in the number of people killed or seriously injured in road traffic accidents, based on a 3-year rolling average up to the current year. A positive figure indicates improved performance (i.e., a reduction in casualties compared to the previous 3-year period).

Performance Target: For comparability, performance is also assessed against a target to reduce KSI numbers by 40% over 10 years.

Scope: Includes people of all ages killed or seriously injured on the roads. Previously reported as NI 047.

Definitions:

  • Fatal Casualties: Deaths occurring within 30 days of the accident (excluding confirmed suicides).
  • Seriously Injured Casualties: Injuries requiring hospitalisation or involving fractures, concussion, internal injuries, crushings, burns (excluding friction burns), severe cuts/lacerations, severe shock requiring medical treatment, or injuries causing death 30+ days after the accident.
  • Slight Injuries: Excluded from totals. Includes sprains (e.g., whiplash), bruises, minor cuts, or slight shock requiring roadside attention.

Recording Practices: Police record injuries based on initial information, not medical examination. Hospitalisation practices vary regionally.

Systems Used: Police forces use either CRaSH (Collision Recording and Sharing) or COPA (Case Overview Preparation Application). Estimates are based on police-reported figures.

Data Comparability: Since 2016, changes in severity reporting systems affect comparability of serious and slight injury data. Both adjusted and unadjusted KSI statistics are available.

Further Information: Road Accidents and Considerations: Areas with low resident populations but high traffic inflows (e.g., City of London, rural tourist areas) may show artificially high rates. Heathrow Airport counts are included in London Region and England totals only.

Data is Powered by LG Inform Plus and automatically checked for new data on the 3rd of each month.

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