In road safety, injury severity refers to the level of injury sustained by a casualty involved in a road traffic collision. Injuries are typically categorised into three levels:

The injuries are categorised by the following:

Slight: Injuries that are minor in nature and do not require significant medical attention, such as cuts, bruises, or sprains. These injuries usually allow the casualty to walk away from the scene or require only basic first aid.

Serious: Injuries that necessitate hospital treatment and may result in prolonged recovery or long-term consequences. Examples include fractures, internal injuries, severe lacerations, or injuries requiring surgery but not resulting in death.

Fatal: Injuries that result in death, either at the scene of the collision or within 30 days of the collision, due to the injuries sustained.

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.

KSI (Killed and Seriously Injured) is a widely used road safety metric that refers to the number of casualties who have been killed or seriously injured as a result of road traffic collisions.

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

Road User 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 in Jersey on public roads, parks and pavements).

Vulnerable road users are individuals who are at a higher risk of injury or fatality in the event of a road traffic collision due to their limited physical protection and exposure to vehicles on the road.

Vulnerable Road Users 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

Ridden Horse: Individuals on horseback, using roads

Agricultural Vehicle: Vehicles used primarily for agricultural purposes, includes diggers

Mobility Scooter: Electric vehicles designed for individuals with mobility impairments

E-Scooters: Electric powered scooters