The following terms are used in this note :
| Accident | An incident reported to the Police, involving personal injury occurring on roads in the Territory, in which one or more vehicles are involved. |
| Casualty | A person killed or injured in an accident in which there may be more than one casualty. |
| Fatal accident | A fatal accident is where one or more persons dies within 30 days of the accident. |
| Serious accident | One or more persons injured and detained in hospital for more than twelve hours. |
| Slight accident | One or more persons injured and detention in hospital, if required, will not be more than twelve hours. |
| Fatality | Sustained injury causing death within 30 days of the accident. |
| Serious injury | An injury for which a person is detained in hospital as an 'in-patient' for more than twelve hours. Injuries causing death 30 or more days after the accident is also included in this category. |
| Slight injury | An injury of a minor character such as a sprain, bruise or cut not judged to be severe, or slight shock requiring roadside attention and detention in hospital is less than 12 hours, or not required. |
| Road users | Pedestrians and vehicle users which include all occupants (i.e. driver or rider and passengers, including persons injured while boarding or alighting from the vehicle). |
| Vehicles involved | Vehicles whose drivers or passengers are injured, which hit a pedestrian or another vehicle whose driver or passengers are injured, or which contribute to the accident |