Actions of the police, the rescue service, and the ambulance
When the operative services arrive at the scene, their actions will be based on relatively fixed rules.
The police shuts down traffic when needed, limits access to the scene, and carries out preliminary investigations to determine the causes of the accident.
The rescue service eliminates the risk of fire and helps the victims out of the vehicle.
The ambulance provides first aid and transports the victims to the hospital.
The main objective of all these actions is to save human lives. All actions must be aimed at ensuring that the injured person receives medical assistance as soon as possible without any further injury.
As a rule, the provision of first aid is possible even if the victim is stuck in the vehicle, which is why the expedited evacuation of the victim from the vehicle is imperative only when the vehicle is on fire. The nearby area of the event is searched, because people in shock can escape to the forest, and some injured people may have gone to seek help.
You must then be located outside the police tape, but if you have the information that the operating personnel needs to know, convey it to them (if you saw how the accident happened, if you saw who was driving, if you saw someone leaving the scene, etc.).
NEVER DISTURB THE OPERATIVE STAFF IN ACTION, BUT PROVIDE THEM WITH THE NECESSARY INFORMATION!