Did the traffic police team write the letter of understanding or did you write it yourself?

Write it yourself. The letter of understanding was not written by the traffic police team, but by the victim. After the traffic accident, the actor should actively compensate the other party, cooperate with the public security organ to investigate and solve it, obtain the understanding of the victim and reduce the punishment. The criminal letter of understanding itself has no fixed format, and is generally handled by the responsible lawyer for the criminal suspect.