This might be on topic here, so I'm going to ask it: If a car was hit by another one and responders needed access to it, what key parts should they be aware of the location when entering the vehicle?
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I'd have thought it'd be anything that could cause a fire/explosion - Airbags, batteries and fuel tanks/lines.
The first thing you're going to want to do is cut off the fuel supply. On most cars, this is done off the ignition key, so that'd be your first target.
You don't mention whether you're talking about standard or modified cars - it's an easier question to answer with standard vehicles, as such locations can be readily identified in advance, and tend to be fairly predictable, wheras in a modified vehicle they might not be in the expected locations (for example, batteries might be located in the back of the car for improved weight distribution). Of course, if the vehicle was modified for competition use, there are strict rules regarding such components, including clearly marking the locations of battery cut-off switches and extinguisher triggers.