Slow, unsafe driving – what to do?

Hello dear community, so far I have been a quiet reader and have often received helpful information in case of problems with the car. But now I have a question myself, which has occupied me already a few days. On my way to work and back I meet a different driver regularly. Our common way is about 25km overland. Each time the person drives very slowly and insecure. Outside at allowed 100 we rarely make it over 60km/h. If it is dark and someone e In the morning there is really not much traffic on the track, but the person constantly pulls a column behind him, especially because the overtaking possibilities are quite limited. Inside the village the person blinks already over 200m before the crossing and then rolls very gently towards them. Even turning right becomes a nerve, because she does not dare to drive, even if other cars are still eternities away. Here goes e This is not just a one-time traffic barrier, but a constant insecure and slow driving. Perhaps this person is unfit for driving due to health problems? What can I do here? Is an ad promising to the police? Do not want to be accused afterwards, to harass the person or need it, because I do not (different from others). Can I doubt the ability to drive and report that? Can I ask the police to “take a look” at it. I’m confused. Who has experiences with it, who can give me tips? I’m grateful for everything! Best regards, the silent reader