The StVO § 34 prescribes in case of an accident:
"(A) to remain at the scene of the accident until it has made it possible for his presence, his vehicle and the nature of his participation to be identified by his presence in favor of the other party and the injured party; or (b) a reasonable one in the circumstances To wait and leave name and address at the scene of the accident if no one was prepared to make
7. Immediately enable the findings to be made retrospectively if he has justified himself, apologizes or has left the scene of the accident after expiry of the waiting period (point 6 letter b). To do so, it must notify at least the person entitled (paragraph 6 (a)) or a nearby police station that he / she has been involved in the accident and indicate his address, residence, registration number and location of the vehicle and make such an immediate determination reasonable time to be available. (...) "
Ihren Namen und Ihre Anschrift am beschädigten Fahrzeug hinterlassen und den Unfall unverzüglich der Polizei melden
This rule applies when the driver / owner of the damaged vehicle does not arrive after a reasonable waiting time.