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I was impressed with the idea of this but realised it needed a little thinking about. I have had a chance to do this and suggest the following: >Vehicle. 4. All glass & SRS intact ( therefore no intrusion and Delta V less than 15mph in deployment vector) 3. Doors cannot be opened without equipment (Delta V probably in excess of 45 mph) 2. 30cm or more intrusion into the passenger compartment 1. Opening of the passenger compartment by shearing of metal components Person. 4. Appears stable and no other casualty in vehicle has a serious injury 3. Mechanism of accident or signs suggest potentially unstable 2. Has injuries that classify as URGENT in either sieve or sort 1. Has life threatening time critical injuries (DEAD is not a casualty, its a corpse) Ancillary factors. 4. Uncomplicated extrication 3. Extrication complicated by environmental factors 2. Extrication will require specialist equipment ( cranes, thermal lances etc) 1. Extrication estimated will be in excess of two hours < Comments please, Vic Calland