You want to use a motor vehicle on public roads. What must you observe?

Your answer is correct. In Germany, to use a motor vehicle on public roads, the vehicle must be roadworthy, meaning it is in safe and proper working condition. Additionally, you are legally required to have liability insurance to cover damages or injuries you may cause to others. Being the owner of the vehicle is not a requirement for using it; you can drive vehicles you do not own, as long as you have permission and meet all legal requirements. Remember, always ensure both the technical condition and insurance status of the vehicle before driving on public roads.