What documents do you have to carry with you, if you want to drive a compulsory registrable vehicle?

In Germany, when driving a vehicle that requires compulsory registration, you must always carry your driving licence (option 1) because it proves that you are authorized to operate that type of vehicle. Additionally, you must carry the registration certificate Part I (option 2), which is the official document showing that the vehicle is registered and allowed on public roads. The registration certificate Part II (option 3) is not required to be carried in the vehicle; it is mainly for ownership transfer purposes. Carrying both your driving licence and the registration certificate Part I ensures you comply with legal requirements during traffic checks.