Fig. 1

Flow diagram of linkage process between ambulance and motor vehicle crash records.*Significantly empty: no electronic record of assessment, intervention, or clinical case notes;. No patient found: Paramedics arrived on-scene but there was no patient present (e.g. patient absconded); Patient transfer between hospitals; Not emergency: Use of the ambulance for other than delivering patient care, such as transport of equipment; Stood down: Ambulance dispatched but then received a higher priority job or another crew was closer to the scene; Cancelled: Individual calls from the scene and states they no longer require the ambulance; Unable to locate scene: Ambulance is sent but cannot locate the MVC