If they actually were there and witnessed it, of course they can.
As a witness to a bad car accident, a person should stay on the scene until they have told their version of the story to the police. Most often a police officer will want contact information for the witness in case more information is needed.
If you have a reliable witness that can testify where you were when the accident occurred, or can testify that someone else had your car at the time, that will help.
As soon as the accident happens two people automatically know the whole truth about the accident. Gatsby is in the car when Daisy hits Myrtle. Gatsby tells Nick. Tom is informed. Tom tells George Wilson.
Yes Roderick Pooh Clark was in an accident in 1993, he is paralyzed from the neck down.
the policy that covers the car that is being driven.
No
only if you receive a court summons saying that you need to appear in court to testify.
Yes. Many states have laws that require a witness to an accident (which you would be) to also stop.
Yes. they use the department's official spirit phone line to contact them. The family who charged the person must sign consent forms though, because they may not want to disturb the dead family members.
Has this car been in an accident?
If you are a permissive driver (given permission to drive the vehicle by the named insured), your accident would be covered under the owner of the car's policy. The insurance follows the vehicle, not necessarily the driver. You might want to check the owner's policy. I've seen a clause that specifically excludes damage caused by another vehicle insured by the same person.
Yes you are covered on a family members car insurance if you are driving a vehicle owned and insured by them.....