Identifying and corroborating information is vital.
There's certain information that's absolutely vital. You should be familiar with the roadway that the accident happened on any intersecting streets. You should know the identity of the other driver. You should know their tag number and VIN number if possible. You should certainly know their insurance information and their policy information. Vitally important in these situations, is to have witness contact information. You should also note the presence of any surveillance camera whether government or private that could have possibly captured the event.