what I said was, which was not what you said, they investigate non accidents, too. They are not confined to investigating accidents, they investigate deliberate incidents where people are run down , or any crime that involves a motor driven vehicle, such as transporting a body, ( interfering with a corpse) or using a motor driven artifact to shift a corpse from one place to another, or using a vehicle to store a victim's body, .
If it involves a motor driven artifact, these blokes investigate it, they are not confined to your common or garden road accident.