To properly immobilize a crashed vehicle and ensure the safety of the area, what immediate measures must be taken?

Question

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Within the P.A.S. protocol (Protect, Alert, Succor), the first step is to 'Protect' the accident scene. To safely immobilize the vehicle, it is mandatory to apply the parking brake (handbrake) to prevent unintentional movement and switch off the ignition (cut the engine) to stop the electrical system and fuel pump, thereby minimizing the risk of fire. Using wheel chocks is not the standard immediate measure for cars (it is more common for heavy vehicles), and disconnecting the battery is a technical task usually performed by firefighters to avoid major electrical risks, not by the driver in the first instance.

To properly immobilize a crashed vehicle and ensure the safety of the area, what immediate measures must be taken?

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