The three tiers of categorisation for Collisions and Casualties are: Slight, Serious, and Fatal.

Collision Severity is determined by assessing the most severe injury that occurred in a collision. It categorises the incident into classifications based on the extent of the most significant injury sustained by any individual involved in the collision.

Casualty Severity, on the other hand, refers to the classification of injuries sustained by individuals involved in a road traffic collision. This measure considers the specific injuries each casualty sustains.

For example, in a collision involving two vehicles with four individuals in total, if one person sustains a ‘Serious’ injury while the other three have ‘Slight’ injuries, the entire incident is classified as a ‘Serious Collision.’ This results in the classification of one ‘Serious’ Casualty and three ‘Slight’ Casualties. This method ensures that the severity of the collision is accurately reflected based on the most severe injury sustained.

This term categorises the diverse groups of individuals who use the road.

The main types include:

• Pedestrians: Includes individuals on foot as well as those using wheelchairs, skateboards and
  push scooters
• Pedal Cyclists: Users of bicycles and other pedal-driven vehicles, including E-bikes and cargo
  bikes
• Motorcyclists: Riders of motorcycles, which can be further categorised by engine class or
  electric models
• Cars: Including personal & business vehicles
• Taxi/Private Hire Car: Vehicles licensed to carry passengers for hire
• Minibus, Bus, or Coach: Larger vehicles varying in passenger capacity and usage
• Ridden Horse: Individuals on horseback, using roads
• Agricultural Vehicle: Vehicles used primarily for agricultural purposes, includes diggers
• Goods Vehicles: This category includes lorries and vans, which can be further categorised by
  weight class
• Mobility Scooter: Electric vehicles designed for individuals with mobility impairments
• E-Scooters: Electric powered scooters (currently illegal to use on public roads, parks and
  pavements).