General rules defining the driver's behavior in the event of a breakdown or accident, providing first aid

If you're involved in a car accident in which there are injured persons, are you obliged to leave your car at the scene of the accident?

If you're involved in a car accident in which there are injured parties, can you remove your car from the scene of the accident so that it does not create an obstacle to traffic?

If you're involved in a car accident in which there are fatalities, are you obliged to remain on the scene of the accident after the ambulance service had been called?

If you're involved in a car accident in which there are injured persons, can you leave the scene of the accident once the ambulance service has been called?

You are involved in a motor accident in such a place on the road in a built-up area. Are you obliged to signal the stop of the motor vehicle?