If the personal representative for the deceased person's estate has given a person permission to drive the vehicle once owned by the decedent before title has been transferred over to the beneficiary of the car by Will, trust or intestate succession, there is nothing improper for the use of the car by the third person.
The requirement is that the car should have valid registration and insurance upon it. Plus the driver should have a valid driver's license and insurance to drive a motor vehicle.
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